author Sebastian Hengst <>
Tue, 29 Dec 2015 17:42:02 +0100
changeset 312974 54a19e8d57c42fc139e49d84c880f559ef240f8c
parent 312962 bf73cf8f0fdac96af8e43da129b9544f127599bb
child 313281 18186849973ce4832d7230b3ceb5627ab43dbaf2
permissions -rw-r--r--
Backed out 15 changesets (bug 1208944) for failing tests M(2,5) on OSX. r=backout Backed out changeset c29de223de2f (bug 1208944) Backed out changeset 3d99da255be1 (bug 1209844) Backed out changeset 3c915942af38 (bug 1209844) Backed out changeset 759b425b5503 (bug 1208944) Backed out changeset bf73cf8f0fda (bug 1208944) Backed out changeset 0e337d912b7d (bug 1208944) Backed out changeset 31c47f2980b5 (bug 1208944) Backed out changeset 3e0d70a6e809 (bug 1208944) Backed out changeset 7685dcb63e5f (bug 1208944) Backed out changeset 3c2b9372dd36 (bug 1208944) Backed out changeset 18160d306493 (bug 1208944) Backed out changeset 4974e397b655 (bug 1208944) Backed out changeset fde7e439844d (bug 1208944) Backed out changeset 4213a355fbdc (bug 1208944) Backed out changeset 33cfddbbf5f2 (bug 1208944)

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set sw=4 ts=8 et tw=80 : */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at */

#ifndef mozilla_tabs_TabParent_h
#define mozilla_tabs_TabParent_h

#include "js/TypeDecls.h"
#include "mozilla/ContentCache.h"
#include "mozilla/dom/AudioChannelBinding.h"
#include "mozilla/dom/ipc/IdType.h"
#include "mozilla/dom/PBrowserParent.h"
#include "mozilla/dom/PContent.h"
#include "mozilla/dom/PFilePickerParent.h"
#include "mozilla/dom/TabContext.h"
#include "mozilla/EventForwards.h"
#include "mozilla/dom/File.h"
#include "mozilla/RefPtr.h"
#include "nsCOMPtr.h"
#include "nsIAuthPromptProvider.h"
#include "nsIBrowserDOMWindow.h"
#include "nsIDOMEventListener.h"
#include "nsISecureBrowserUI.h"
#include "nsITabParent.h"
#include "nsIWebBrowserPersistable.h"
#include "nsIXULBrowserWindow.h"
#include "nsRefreshDriver.h"
#include "nsWeakReference.h"
#include "Units.h"
#include "nsIWidget.h"

class nsFrameLoader;
class nsIFrameLoader;
class nsIContent;
class nsIPrincipal;
class nsIURI;
class nsILoadContext;
class nsIDocShell;

namespace mozilla {

namespace a11y {
class DocAccessibleParent;

namespace jsipc {
class CpowHolder;
} // namespace jsipc

namespace layers {
class AsyncDragMetrics;
struct FrameMetrics;
struct TextureFactoryIdentifier;
} // namespace layers

namespace layout {
class RenderFrameParent;
} // namespace layout

namespace widget {
struct IMENotification;
} // namespace widget

namespace gfx {
class SourceSurface;
class DataSourceSurface;
} // namespace gfx

namespace dom {

class ClonedMessageData;
class nsIContentParent;
class Element;
class DataTransfer;

namespace ipc {
class StructuredCloneData;
} // ipc namespace

class TabParent final : public PBrowserParent
                      , public nsIDOMEventListener
                      , public nsITabParent
                      , public nsIAuthPromptProvider
                      , public nsISecureBrowserUI
                      , public nsSupportsWeakReference
                      , public TabContext
                      , public nsAPostRefreshObserver
                      , public nsIWebBrowserPersistable
    typedef mozilla::dom::ClonedMessageData ClonedMessageData;
    typedef mozilla::layers::AsyncDragMetrics AsyncDragMetrics;

    virtual ~TabParent();

    // Helper class for ContentParent::RecvCreateWindow.
    struct AutoUseNewTab;

    // nsITabParent
    // nsIDOMEventListener interfaces

    TabParent(nsIContentParent* aManager,
              const TabId& aTabId,
              const TabContext& aContext,
              uint32_t aChromeFlags);
    Element* GetOwnerElement() const { return mFrameElement; }
    void SetOwnerElement(Element* aElement);

    void CacheFrameLoader(nsFrameLoader* aFrameLoader);

     * Get the mozapptype attribute from this TabParent's owner DOM element.
    void GetAppType(nsAString& aOut);

     * Returns true iff this TabParent's nsIFrameLoader is visible.
     * The frameloader's visibility can be independent of e.g. its docshell's
     * visibility.
    bool IsVisible();

    nsIBrowserDOMWindow *GetBrowserDOMWindow() { return mBrowserDOMWindow; }
    void SetBrowserDOMWindow(nsIBrowserDOMWindow* aBrowserDOMWindow) {
        mBrowserDOMWindow = aBrowserDOMWindow;

    void SetHasContentOpener(bool aHasContentOpener);

    void SwapFrameScriptsFrom(nsTArray<FrameScriptInfo>& aFrameScripts) {

    already_AddRefed<nsILoadContext> GetLoadContext();
    already_AddRefed<nsIWidget> GetTopLevelWidget();
    nsIXULBrowserWindow* GetXULBrowserWindow();

    void Destroy();
    void Detach();
    void Attach(nsFrameLoader* aFrameLoader);

    void RemoveWindowListeners();
    void AddWindowListeners();
    void DidRefresh() override;

    virtual bool RecvMoveFocus(const bool& aForward,
                               const bool& aForDocumentNavigation) override;
    virtual bool RecvEvent(const RemoteDOMEvent& aEvent) override;
    virtual bool RecvReplyKeyEvent(const WidgetKeyboardEvent& aEvent) override;
    virtual bool RecvDispatchAfterKeyboardEvent(const WidgetKeyboardEvent& aEvent) override;
    virtual bool RecvBrowserFrameOpenWindow(PBrowserParent* aOpener,
                                            const nsString& aURL,
                                            const nsString& aName,
                                            const nsString& aFeatures,
                                            bool* aOutWindowOpened) override;
    virtual bool RecvSyncMessage(const nsString& aMessage,
                                 const ClonedMessageData& aData,
                                 InfallibleTArray<CpowEntry>&& aCpows,
                                 const IPC::Principal& aPrincipal,
                                 nsTArray<ipc::StructuredCloneData>* aRetVal) override;
    virtual bool RecvRpcMessage(const nsString& aMessage,
                                const ClonedMessageData& aData,
                                InfallibleTArray<CpowEntry>&& aCpows,
                                const IPC::Principal& aPrincipal,
                                nsTArray<ipc::StructuredCloneData>* aRetVal) override;
    virtual bool RecvAsyncMessage(const nsString& aMessage,
                                  const ClonedMessageData& aData,
                                  InfallibleTArray<CpowEntry>&& aCpows,
                                  const IPC::Principal& aPrincipal) override;
    virtual bool RecvNotifyIMEFocus(const ContentCache& aContentCache,
                                    const widget::IMENotification& aEventMessage,
                                    nsIMEUpdatePreference* aPreference)
    virtual bool RecvNotifyIMETextChange(const ContentCache& aContentCache,
                                         const widget::IMENotification& aEventMessage) override;
    virtual bool RecvNotifyIMECompositionUpdate(const ContentCache& aContentCache,
                                                const widget::IMENotification& aEventMessage) override;
    virtual bool RecvNotifyIMESelection(const ContentCache& aContentCache,
                                        const widget::IMENotification& aEventMessage) override;
    virtual bool RecvUpdateContentCache(const ContentCache& aContentCache) override;
    virtual bool RecvNotifyIMEMouseButtonEvent(const widget::IMENotification& aEventMessage,
                                               bool* aConsumedByIME) override;
    virtual bool RecvNotifyIMEPositionChange(const ContentCache& aContentCache,
                                             const widget::IMENotification& aEventMessage) override;
    virtual bool RecvOnEventNeedingAckHandled(const EventMessage& aMessage) override;
    virtual bool RecvRequestIMEToCommitComposition(const bool& aCancel,
                                                   bool* aIsCommitted,
                                                   nsString* aCommittedString) override;
    virtual bool RecvStartPluginIME(const WidgetKeyboardEvent& aKeyboardEvent,
                                    const int32_t& aPanelX,
                                    const int32_t& aPanelY,
                                    nsString* aCommitted) override;
    virtual bool RecvSetPluginFocused(const bool& aFocused) override;
    virtual bool RecvGetInputContext(int32_t* aIMEEnabled,
                                     int32_t* aIMEOpen) override;
    virtual bool RecvSetInputContext(const int32_t& aIMEEnabled,
                                     const int32_t& aIMEOpen,
                                     const nsString& aType,
                                     const nsString& aInputmode,
                                     const nsString& aActionHint,
                                     const int32_t& aCause,
                                     const int32_t& aFocusChange) override;
    virtual bool RecvRequestFocus(const bool& aCanRaise) override;
    virtual bool RecvEnableDisableCommands(const nsString& aAction,
                                           nsTArray<nsCString>&& aEnabledCommands,
                                           nsTArray<nsCString>&& aDisabledCommands) override;
    virtual bool RecvSetCursor(const uint32_t& aValue, const bool& aForce) override;
    virtual bool RecvSetCustomCursor(const nsCString& aUri,
                                     const uint32_t& aWidth,
                                     const uint32_t& aHeight,
                                     const uint32_t& aStride,
                                     const uint8_t& aFormat,
                                     const uint32_t& aHotspotX,
                                     const uint32_t& aHotspotY,
                                     const bool& aForce) override;
    virtual bool RecvSetStatus(const uint32_t& aType, const nsString& aStatus) override;
    virtual bool RecvIsParentWindowMainWidgetVisible(bool* aIsVisible) override;
    virtual bool RecvShowTooltip(const uint32_t& aX, const uint32_t& aY, const nsString& aTooltip) override;
    virtual bool RecvHideTooltip() override;
    virtual bool RecvGetDPI(float* aValue) override;
    virtual bool RecvGetDefaultScale(double* aValue) override;
    virtual bool RecvGetMaxTouchPoints(uint32_t* aTouchPoints) override;
    virtual bool RecvGetWidgetNativeData(WindowsHandle* aValue) override;
    virtual bool RecvSetNativeChildOfShareableWindow(const uintptr_t& childWindow) override;
    virtual bool RecvDispatchFocusToTopLevelWindow() override;
    virtual bool RecvZoomToRect(const uint32_t& aPresShellId,
                                const ViewID& aViewId,
                                const CSSRect& aRect) override;
    virtual bool RecvUpdateZoomConstraints(const uint32_t& aPresShellId,
                                           const ViewID& aViewId,
                                           const MaybeZoomConstraints& aConstraints) override;
    virtual bool RecvRespondStartSwipeEvent(const uint64_t& aInputBlockId,
                                            const bool& aStartSwipe) override;
    virtual bool RecvContentReceivedInputBlock(const ScrollableLayerGuid& aGuid,
                                               const uint64_t& aInputBlockId,
                                               const bool& aPreventDefault) override;
    virtual bool RecvSetTargetAPZC(const uint64_t& aInputBlockId,
                                   nsTArray<ScrollableLayerGuid>&& aTargets) override;
    virtual bool RecvSetAllowedTouchBehavior(const uint64_t& aInputBlockId,
                                             nsTArray<TouchBehaviorFlags>&& aTargets) override;
    virtual bool RecvDispatchWheelEvent(const mozilla::WidgetWheelEvent& aEvent) override;
    virtual bool RecvDispatchMouseEvent(const mozilla::WidgetMouseEvent& aEvent) override;
    virtual bool RecvDispatchKeyboardEvent(const mozilla::WidgetKeyboardEvent& aEvent) override;
    virtual bool RecvStartScrollbarDrag(const AsyncDragMetrics& aDragMetrics) override;

    virtual PColorPickerParent*
    AllocPColorPickerParent(const nsString& aTitle, const nsString& aInitialColor) override;
    virtual bool DeallocPColorPickerParent(PColorPickerParent* aColorPicker) override;

    virtual PDocAccessibleParent*
    AllocPDocAccessibleParent(PDocAccessibleParent*, const uint64_t&) override;
    virtual bool DeallocPDocAccessibleParent(PDocAccessibleParent*) override;
    virtual bool
    RecvPDocAccessibleConstructor(PDocAccessibleParent* aDoc,
                                  PDocAccessibleParent* aParentDoc,
                                  const uint64_t& aParentID) override;

     * Return the top level doc accessible parent for this tab.
    a11y::DocAccessibleParent* GetTopLevelDocAccessible() const;

    void LoadURL(nsIURI* aURI);
    // XXX/cjones: it's not clear what we gain by hiding these
    // message-sending functions under a layer of indirection and
    // eating the return values
    void Show(const ScreenIntSize& size, bool aParentIsActive);
    void UpdateDimensions(const nsIntRect& rect, const ScreenIntSize& size);
    void UpdateFrame(const layers::FrameMetrics& aFrameMetrics);
    void UIResolutionChanged();
    void ThemeChanged();
    void HandleAccessKey(nsTArray<uint32_t>& aCharCodes,
                         const bool& aIsTrusted,
                         const int32_t& aModifierMask);
    void RequestFlingSnap(const FrameMetrics::ViewID& aScrollId,
                          const mozilla::CSSPoint& aDestination);
    void AcknowledgeScrollUpdate(const ViewID& aScrollId, const uint32_t& aScrollGeneration);
    void HandleDoubleTap(const CSSPoint& aPoint,
                         Modifiers aModifiers,
                         const ScrollableLayerGuid& aGuid);
    void HandleSingleTap(const CSSPoint& aPoint,
                         Modifiers aModifiers,
                         const ScrollableLayerGuid& aGuid);
    void HandleLongTap(const CSSPoint& aPoint,
                       Modifiers aModifiers,
                       const ScrollableLayerGuid& aGuid,
                       uint64_t aInputBlockId);
    void NotifyAPZStateChange(ViewID aViewId,
                              APZStateChange aChange,
                              int aArg);
    void NotifyMouseScrollTestEvent(const ViewID& aScrollId, const nsString& aEvent);
    void NotifyFlushComplete();
    void Activate();
    void Deactivate();

    bool MapEventCoordinatesForChildProcess(mozilla::WidgetEvent* aEvent);
    void MapEventCoordinatesForChildProcess(const LayoutDeviceIntPoint& aOffset,
                                            mozilla::WidgetEvent* aEvent);
    LayoutDeviceToCSSScale GetLayoutDeviceToCSSScale();

    virtual bool RecvRequestNativeKeyBindings(const mozilla::WidgetKeyboardEvent& aEvent,
                                              MaybeNativeKeyBinding* aBindings) override;

    virtual bool RecvSynthesizeNativeKeyEvent(const int32_t& aNativeKeyboardLayout,
                                              const int32_t& aNativeKeyCode,
                                              const uint32_t& aModifierFlags,
                                              const nsString& aCharacters,
                                              const nsString& aUnmodifiedCharacters,
                                              const uint64_t& aObserverId) override;
    virtual bool RecvSynthesizeNativeMouseEvent(const LayoutDeviceIntPoint& aPoint,
                                                const uint32_t& aNativeMessage,
                                                const uint32_t& aModifierFlags,
                                                const uint64_t& aObserverId) override;
    virtual bool RecvSynthesizeNativeMouseMove(const LayoutDeviceIntPoint& aPoint,
                                               const uint64_t& aObserverId) override;
    virtual bool RecvSynthesizeNativeMouseScrollEvent(const LayoutDeviceIntPoint& aPoint,
                                                      const uint32_t& aNativeMessage,
                                                      const double& aDeltaX,
                                                      const double& aDeltaY,
                                                      const double& aDeltaZ,
                                                      const uint32_t& aModifierFlags,
                                                      const uint32_t& aAdditionalFlags,
                                                      const uint64_t& aObserverId) override;
    virtual bool RecvSynthesizeNativeTouchPoint(const uint32_t& aPointerId,
                                                const TouchPointerState& aPointerState,
                                                const ScreenIntPoint& aPointerScreenPoint,
                                                const double& aPointerPressure,
                                                const uint32_t& aPointerOrientation,
                                                const uint64_t& aObserverId) override;
    virtual bool RecvSynthesizeNativeTouchTap(const ScreenIntPoint& aPointerScreenPoint,
                                              const bool& aLongTap,
                                              const uint64_t& aObserverId) override;
    virtual bool RecvClearNativeTouchSequence(const uint64_t& aObserverId) override;

    void SendMouseEvent(const nsAString& aType, float aX, float aY,
                        int32_t aButton, int32_t aClickCount,
                        int32_t aModifiers, bool aIgnoreRootScrollFrame);
    void SendKeyEvent(const nsAString& aType, int32_t aKeyCode,
                      int32_t aCharCode, int32_t aModifiers,
                      bool aPreventDefault);
    bool SendRealMouseEvent(mozilla::WidgetMouseEvent& event);
    bool SendRealDragEvent(mozilla::WidgetDragEvent& aEvent, uint32_t aDragAction,
                           uint32_t aDropEffect);
    bool SendMouseWheelEvent(mozilla::WidgetWheelEvent& event);
    bool SendRealKeyEvent(mozilla::WidgetKeyboardEvent& event);
    bool SendRealTouchEvent(WidgetTouchEvent& event);
    bool SendHandleSingleTap(const CSSPoint& aPoint, const Modifiers& aModifiers, const ScrollableLayerGuid& aGuid);
    bool SendHandleLongTap(const CSSPoint& aPoint, const Modifiers& aModifiers, const ScrollableLayerGuid& aGuid, const uint64_t& aInputBlockId);
    bool SendHandleDoubleTap(const CSSPoint& aPoint, const Modifiers& aModifiers, const ScrollableLayerGuid& aGuid);

    virtual PDocumentRendererParent*
    AllocPDocumentRendererParent(const nsRect& documentRect,
                                 const gfx::Matrix& transform,
                                 const nsString& bgcolor,
                                 const uint32_t& renderFlags,
                                 const bool& flushLayout,
                                 const nsIntSize& renderSize) override;
    virtual bool DeallocPDocumentRendererParent(PDocumentRendererParent* actor) override;

    virtual PFilePickerParent*
    AllocPFilePickerParent(const nsString& aTitle,
                           const int16_t& aMode) override;
    virtual bool DeallocPFilePickerParent(PFilePickerParent* actor) override;

    virtual PIndexedDBPermissionRequestParent*
    AllocPIndexedDBPermissionRequestParent(const Principal& aPrincipal)

    virtual bool
                                      PIndexedDBPermissionRequestParent* aActor,
                                      const Principal& aPrincipal)

    virtual bool
                                      PIndexedDBPermissionRequestParent* aActor)

    bool GetGlobalJSObject(JSContext* cx, JSObject** globalp);


    bool HandleQueryContentEvent(mozilla::WidgetQueryContentEvent& aEvent);
    bool SendCompositionEvent(mozilla::WidgetCompositionEvent& event);
    bool SendSelectionEvent(mozilla::WidgetSelectionEvent& event);

    static TabParent* GetFrom(nsFrameLoader* aFrameLoader);
    static TabParent* GetFrom(nsIFrameLoader* aFrameLoader);
    static TabParent* GetFrom(nsITabParent* aTabParent);
    static TabParent* GetFrom(PBrowserParent* aTabParent);
    static TabParent* GetFrom(nsIContent* aContent);
    static TabId GetTabIdFrom(nsIDocShell* docshell);

    nsIContentParent* Manager() { return mManager; }

     * Let managees query if Destroy() is already called so they don't send out
     * messages when the PBrowser actor is being destroyed.
    bool IsDestroyed() const { return mIsDestroyed; }

    already_AddRefed<nsIWidget> GetWidget() const;

    const TabId GetTabId() const
      return mTabId;

    LayoutDeviceIntPoint GetChildProcessOffset();

     * Native widget remoting protocol for use with windowed plugins with e10s.
    virtual PPluginWidgetParent* AllocPPluginWidgetParent() override;
    virtual bool DeallocPPluginWidgetParent(PPluginWidgetParent* aActor) override;

    void SetInitedByParent() { mInitedByParent = true; }
    bool IsInitedByParent() const { return mInitedByParent; }

    static TabParent* GetNextTabParent();

    bool SendLoadRemoteScript(const nsString& aURL,
                              const bool& aRunInGlobalScope);

    // See nsIFrameLoader requestNotifyLayerTreeReady.
    bool RequestNotifyLayerTreeReady();
    bool RequestNotifyLayerTreeCleared();
    bool LayerTreeUpdate(bool aActive);
    void SwapLayerTreeObservers(TabParent* aOther);

    virtual bool
    RecvInvokeDragSession(nsTArray<IPCDataTransfer>&& aTransfers,
                          const uint32_t& aAction,
                          const nsCString& aVisualDnDData,
                          const uint32_t& aWidth, const uint32_t& aHeight,
                          const uint32_t& aStride, const uint8_t& aFormat,
                          const int32_t& aDragAreaX, const int32_t& aDragAreaY) override;

    void AddInitialDnDDataTo(DataTransfer* aDataTransfer);

    void TakeDragVisualization(RefPtr<mozilla::gfx::SourceSurface>& aSurface,
                               int32_t& aDragAreaX, int32_t& aDragAreaY);
    layout::RenderFrameParent* GetRenderFrame();

    // Called by HttpChannelParent. The function may use a new process to
    // reload the URI associated with the given channel.
    void OnStartSignedPackageRequest(nsIChannel* aChannel,
                                     const nsACString& aPackageId);

    void AudioChannelChangeNotification(nsPIDOMWindow* aWindow,
                                        AudioChannel aAudioChannel,
                                        float aVolume,
                                        bool aMuted);

    bool ReceiveMessage(const nsString& aMessage,
                        bool aSync,
                        ipc::StructuredCloneData* aData,
                        mozilla::jsipc::CpowHolder* aCpows,
                        nsIPrincipal* aPrincipal,
                        nsTArray<ipc::StructuredCloneData>* aJSONRetVal = nullptr);

    virtual bool RecvAsyncAuthPrompt(const nsCString& aUri,
                                     const nsString& aRealm,
                                     const uint64_t& aCallbackId) override;

    virtual bool Recv__delete__() override;

    virtual void ActorDestroy(ActorDestroyReason why) override;

    Element* mFrameElement;
    nsCOMPtr<nsIBrowserDOMWindow> mBrowserDOMWindow;

    virtual PRenderFrameParent* AllocPRenderFrameParent() override;
    virtual bool DeallocPRenderFrameParent(PRenderFrameParent* aFrame) override;

    virtual bool RecvRemotePaintIsReady() override;

    virtual bool RecvGetRenderFrameInfo(PRenderFrameParent* aRenderFrame,
                                        TextureFactoryIdentifier* aTextureFactoryIdentifier,
                                        uint64_t* aLayersId) override;

    virtual bool RecvSetDimensions(const uint32_t& aFlags,
                                   const int32_t& aX, const int32_t& aY,
                                   const int32_t& aCx, const int32_t& aCy) override;

    virtual bool RecvAudioChannelActivityNotification(const uint32_t& aAudioChannel,
                                                      const bool& aActive) override;

    bool InitBrowserConfiguration(const nsCString& aURI,
                                  BrowserConfiguration& aConfiguration);

    // Decide whether we have to use a new process to reload the URI associated
    // with the given channel.
    bool ShouldSwitchProcess(nsIChannel* aChannel, const nsACString& aSignedPkg);

    ContentCacheInParent mContentCache;

    nsIntRect mRect;
    ScreenIntSize mDimensions;
    ScreenOrientationInternal mOrientation;
    float mDPI;
    CSSToLayoutDeviceScale mDefaultScale;
    bool mUpdatedDimensions;
    LayoutDeviceIntPoint mChromeOffset;

    void DestroyInternal();
    already_AddRefed<nsFrameLoader> GetFrameLoader(bool aUseCachedFrameLoaderAfterDestroy = false) const;
    RefPtr<nsIContentParent> mManager;
    void TryCacheDPIAndScale();

    nsresult UpdatePosition();

    CSSPoint AdjustTapToChildWidget(const CSSPoint& aPoint);

    bool AsyncPanZoomEnabled() const;

    // Cached value indicating the docshell active state of the remote browser.
    bool mDocShellIsActive;

    // Update state prior to routing an APZ-aware event to the child process.
    // |aOutTargetGuid| will contain the identifier
    // of the APZC instance that handled the event. aOutTargetGuid may be null.
    // |aOutInputBlockId| will contain the identifier of the input block
    // that this event was added to, if there was one. aOutInputBlockId may be null.
    // |aOutApzResponse| will contain the response that the APZ gave when processing
    // the input block; this is used for generating appropriate pointercancel events.
    void ApzAwareEventRoutingToChild(ScrollableLayerGuid* aOutTargetGuid,
                                     uint64_t* aOutInputBlockId,
                                     nsEventStatus* aOutApzResponse);
    // When true, we've initiated normal shutdown and notified our managing PContent.
    bool mMarkedDestroying;
    // When true, the TabParent is invalid and we should not send IPC messages anymore.
    bool mIsDestroyed;
    // When true, the TabParent is detached from the frame loader.
    bool mIsDetached;
    // Whether we have already sent a FileDescriptor for the app package.
    bool mAppPackageFileDescriptorSent;

    // Whether we need to send the offline status to the TabChild
    // This is true, until the first call of LoadURL
    bool mSendOfflineStatus;

    uint32_t mChromeFlags;

    struct DataTransferItem
      nsCString mFlavor;
      nsString mStringData;
      RefPtr<mozilla::dom::BlobImpl> mBlobData;
      enum DataType
      DataType mType;
    nsTArray<nsTArray<DataTransferItem>> mInitialDataTransferItems;

    RefPtr<gfx::DataSourceSurface> mDnDVisualization;
    int32_t mDragAreaX;
    int32_t mDragAreaY;

    // When true, the TabParent is initialized without child side's request.
    // When false, the TabParent is initialized by from child side.
    bool mInitedByParent;

    nsCOMPtr<nsILoadContext> mLoadContext;

    // We keep a strong reference to the frameloader after we've sent the
    // Destroy message and before we've received __delete__. This allows us to
    // dispatch message manager messages during this time.
    RefPtr<nsFrameLoader> mFrameLoader;

    TabId mTabId;

    // When loading a new tab or window via, the child process sends
    // a new PBrowser to use. We store that tab in sNextTabParent and then
    // proceed through the browser's normal paths to create a new
    // window/tab. When it comes time to create a new TabParent, we instead use
    // sNextTabParent.
    static TabParent* sNextTabParent;

    // When loading a new tab or window via, the child is
    // responsible for loading the URL it wants into the new TabChild. When the
    // parent receives the CreateWindow message, though, it sends a LoadURL
    // message, usually for about:blank. It's important for the about:blank load
    // to get processed because the Firefox frontend expects every new window to
    // immediately start loading something (see bug 1123090). However, we want
    // the child to process the LoadURL message before it returns from
    // ProvideWindow so that the URL sent from the parent doesn't override the
    // child's URL. This is not possible using our IPC mechanisms. To solve the
    // problem, we skip sending the LoadURL message in the parent and instead
    // return the URL as a result from CreateWindow. The child simulates
    // receiving a LoadURL message before returning from ProvideWindow.
    // The mCreatingWindow flag is set while dispatching CreateWindow. During
    // that time, any LoadURL calls are skipped and the URL is stored in
    // mSkippedURL.
    bool mCreatingWindow;
    nsCString mDelayedURL;

    // When loading a new tab or window via, we want to ensure that
    // frame scripts for that tab are loaded before any scripts start to run in
    // the window. We can't load the frame scripts the normal way, using
    // separate IPC messages, since they won't be processed by the child until
    // returning to the event loop, which is too late. Instead, we queue up
    // frame scripts that we intend to load and send them as part of the
    // CreateWindow response. Then TabChild loads them immediately.
    nsTArray<FrameScriptInfo> mDelayedFrameScripts;

    // If the user called RequestNotifyLayerTreeReady and the RenderFrameParent
    // wasn't ready yet, we set this flag and call RequestNotifyLayerTreeReady
    // again once the RenderFrameParent arrives.
    bool mNeedLayerTreeReadyNotification;

    // Cached cursor setting from TabChild.  When the cursor is over the tab,
    // it should take this appearance.
    nsCursor mCursor;
    nsCOMPtr<imgIContainer> mCustomCursor;
    uint32_t mCustomCursorHotspotX, mCustomCursorHotspotY;

    // True if the cursor changes from the TabChild should change the widget
    // cursor.  This happens whenever the cursor is in the tab's region.
    bool mTabSetsCursor;

    RefPtr<nsIPresShell> mPresShellWithRefreshListener;

    bool mHasContentOpener;

    DebugOnly<int32_t> mActiveSupressDisplayportCount;

    ShowInfo GetShowInfo();
    // This is used when APZ needs to find the TabParent associated with a layer
    // to dispatch events.
    typedef nsDataHashtable<nsUint64HashKey, TabParent*> LayerToTabParentTable;
    static LayerToTabParentTable* sLayerToTabParentTable;

    static void AddTabParentToTable(uint64_t aLayersId, TabParent* aTabParent);
    static void RemoveTabParentFromTable(uint64_t aLayersId);

    static TabParent* GetTabParentFromLayersId(uint64_t aLayersId);

struct MOZ_STACK_CLASS TabParent::AutoUseNewTab final
    AutoUseNewTab(TabParent* aNewTab, bool* aWindowIsNew, nsCString* aURLToLoad)
     : mNewTab(aNewTab), mWindowIsNew(aWindowIsNew), mURLToLoad(aURLToLoad)

        TabParent::sNextTabParent = aNewTab;
        aNewTab->mCreatingWindow = true;

        mNewTab->mCreatingWindow = false;
        *mURLToLoad = mNewTab->mDelayedURL;

        if (TabParent::sNextTabParent) {
            MOZ_ASSERT(TabParent::sNextTabParent == mNewTab);
            TabParent::sNextTabParent = nullptr;
            *mWindowIsNew = false;

    TabParent* mNewTab;
    bool* mWindowIsNew;
    nsCString* mURLToLoad;

} // namespace dom
} // namespace mozilla