author Ryan Hunt <>
Tue, 26 Jun 2018 13:40:10 -0500
changeset 424924 e438548991db2848923dddd391912141814752c7
parent 421327 88bbaa441a370279eb24f8850947974772d93697
child 424926 6e5891e3bbd24b81af1f67a6d15d3486a05bd641
permissions -rw-r--r--
Bug 1470528 - Implement CONTENT_FRAME_TIME for the non-webrender codepath. r=sotaro This commit adds the CONTENT_FRAME_TIME metric which tracks the time from the beginning of a paint in the content process until it is presented in the compositor. There is existing logging for frame latency which tracks from the beginning of a refresh tick until the frame is presented. This is undesirable for this probe as javascript and layout can run in this time period. So this probe uses the existing infrastructure for logging frame latency, but uses a start time from BeginTransaction in layer manager. MozReview-Commit-ID: 5z9LS3tsZTY

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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_layers_CompositorBridgeParent_h
#define mozilla_layers_CompositorBridgeParent_h

// Enable this pref to turn on compositor performance warning.
// This will print warnings if the compositor isn't meeting
// its responsiveness objectives:
//    1) Compose a frame within 15ms of receiving a ScheduleCompositeCall
//    2) Unless a frame was composited within the throttle threshold in
//       which the deadline will be 15ms + throttle threshold

#include <stdint.h>                     // for uint64_t
#include "Layers.h"                     // for Layer
#include "mozilla/Assertions.h"         // for MOZ_ASSERT_HELPER2
#include "mozilla/Attributes.h"         // for override
#include "mozilla/Maybe.h"
#include "mozilla/Monitor.h"            // for Monitor
#include "mozilla/RefPtr.h"             // for RefPtr
#include "mozilla/TimeStamp.h"          // for TimeStamp
#include "mozilla/dom/ipc/IdType.h"
#include "mozilla/gfx/Point.h"          // for IntSize
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/layers/CompositorController.h"
#include "mozilla/layers/CompositorOptions.h"
#include "mozilla/layers/CompositorVsyncSchedulerOwner.h"
#include "mozilla/layers/GeckoContentController.h"
#include "mozilla/layers/ISurfaceAllocator.h" // for ShmemAllocator
#include "mozilla/layers/LayersMessages.h"  // for TargetConfig
#include "mozilla/layers/MetricsSharingController.h"
#include "mozilla/layers/PCompositorBridgeParent.h"
#include "mozilla/layers/APZTestData.h"
#include "mozilla/webrender/WebRenderTypes.h"
#include "mozilla/widget/CompositorWidget.h"
#include "nsISupportsImpl.h"
#include "ThreadSafeRefcountingWithMainThreadDestruction.h"
#include "mozilla/layers/UiCompositorControllerParent.h"

class MessageLoop;
class nsIWidget;

namespace mozilla {

class CancelableRunnable;

namespace gfx {
class DrawTarget;
class GPUProcessManager;
class GPUParent;
} // namespace gfx

namespace ipc {
class Shmem;
} // namespace ipc

namespace layers {

class APZCTreeManager;
class APZCTreeManagerParent;
class APZSampler;
class APZUpdater;
class AsyncCompositionManager;
class AsyncImagePipelineManager;
class Compositor;
class CompositorAnimationStorage;
class CompositorBridgeParent;
class CompositorManagerParent;
class CompositorVsyncScheduler;
class HostLayerManager;
class IAPZCTreeManager;
class LayerTransactionParent;
class PAPZParent;
class CrossProcessCompositorBridgeParent;
class CompositorThreadHolder;
class InProcessCompositorSession;
class WebRenderBridgeParent;

struct ScopedLayerTreeRegistration
  ScopedLayerTreeRegistration(APZCTreeManager* aApzctm,
                              LayersId aLayersId,
                              Layer* aRoot,
                              GeckoContentController* aController);

  LayersId mLayersId;

class CompositorBridgeParentBase : public PCompositorBridgeParent,
                                   public HostIPCAllocator,
                                   public ShmemAllocator,
                                   public MetricsSharingController
  explicit CompositorBridgeParentBase(CompositorManagerParent* aManager);

  virtual void ShadowLayersUpdated(LayerTransactionParent* aLayerTree,
                                   const TransactionInfo& aInfo,
                                   bool aHitTestUpdate) = 0;

  virtual AsyncCompositionManager* GetCompositionManager(LayerTransactionParent* aLayerTree) { return nullptr; }

  virtual void NotifyClearCachedResources(LayerTransactionParent* aLayerTree) { }

  virtual void ScheduleComposite(LayerTransactionParent* aLayerTree) { }
  virtual bool SetTestSampleTime(const LayersId& aId,
                                 const TimeStamp& aTime) { return true; }
  virtual void LeaveTestMode(const LayersId& aId) { }
  enum class TransformsToSkip : uint8_t { NoneOfThem = 0, APZ = 1 };
  virtual void ApplyAsyncProperties(LayerTransactionParent* aLayerTree,
                                    TransformsToSkip aSkip) = 0;
  virtual void SetTestAsyncScrollOffset(const LayersId& aLayersId,
                                        const FrameMetrics::ViewID& aScrollId,
                                        const CSSPoint& aPoint) = 0;
  virtual void SetTestAsyncZoom(const LayersId& aLayersId,
                                const FrameMetrics::ViewID& aScrollId,
                                const LayerToParentLayerScale& aZoom) = 0;
  virtual void FlushApzRepaints(const LayersId& aLayersId) = 0;
  virtual void GetAPZTestData(const LayersId& aLayersId,
                              APZTestData* aOutData) { }
  virtual void SetConfirmedTargetAPZC(const LayersId& aLayersId,
                                      const uint64_t& aInputBlockId,
                                      const nsTArray<ScrollableLayerGuid>& aTargets) = 0;
  virtual void UpdatePaintTime(LayerTransactionParent* aLayerTree, const TimeDuration& aPaintTime) {}

  ShmemAllocator* AsShmemAllocator() override { return this; }

  CompositorBridgeParentBase* AsCompositorBridgeParentBase() override { return this; }

  mozilla::ipc::IPCResult RecvSyncWithCompositor() override { return IPC_OK(); }

  mozilla::ipc::IPCResult Recv__delete__() override { return IPC_OK(); }

  virtual void ObserveLayerUpdate(LayersId aLayersId, uint64_t aEpoch, bool aActive) = 0;

  virtual void DidComposite(LayersId aId, TimeStamp& aCompositeStart, TimeStamp& aCompositeEnd) = 0;

  // HostIPCAllocator
  base::ProcessId GetChildProcessId() override;
  void NotifyNotUsed(PTextureParent* aTexture, uint64_t aTransactionId) override;
  void SendAsyncMessage(const InfallibleTArray<AsyncParentMessageData>& aMessage) override;

  // ShmemAllocator
  bool AllocShmem(size_t aSize,
                  mozilla::ipc::SharedMemory::SharedMemoryType aType,
                  mozilla::ipc::Shmem* aShmem) override;
  bool AllocUnsafeShmem(size_t aSize,
                        mozilla::ipc::SharedMemory::SharedMemoryType aType,
                        mozilla::ipc::Shmem* aShmem) override;
  void DeallocShmem(mozilla::ipc::Shmem& aShmem) override;

  // MetricsSharingController
  NS_IMETHOD_(MozExternalRefCountType) AddRef() override { return HostIPCAllocator::AddRef(); }
  NS_IMETHOD_(MozExternalRefCountType) Release() override { return HostIPCAllocator::Release(); }
  base::ProcessId RemotePid() override;
  bool StartSharingMetrics(mozilla::ipc::SharedMemoryBasic::Handle aHandle,
                           CrossProcessMutexHandle aMutexHandle,
                           LayersId aLayersId,
                           uint32_t aApzcId) override;
  bool StopSharingMetrics(FrameMetrics::ViewID aScrollId,
                          uint32_t aApzcId) override;

  virtual bool IsRemote() const {
    return false;

  ~CompositorBridgeParentBase() override;

  bool mCanSend;

  RefPtr<CompositorManagerParent> mCompositorManager;


class CompositorBridgeParent final : public CompositorBridgeParentBase
                                   , public CompositorController
                                   , public CompositorVsyncSchedulerOwner
  friend class CompositorThreadHolder;
  friend class InProcessCompositorSession;
  friend class gfx::GPUProcessManager;
  friend class gfx::GPUParent;

  NS_IMETHOD_(MozExternalRefCountType) AddRef() override { return CompositorBridgeParentBase::AddRef(); }
  NS_IMETHOD_(MozExternalRefCountType) Release() override { return CompositorBridgeParentBase::Release(); }

  explicit CompositorBridgeParent(CompositorManagerParent* aManager,
                                  CSSToLayoutDeviceScale aScale,
                                  const TimeDuration& aVsyncRate,
                                  const CompositorOptions& aOptions,
                                  bool aUseExternalSurfaceSize,
                                  const gfx::IntSize& aSurfaceSize);

  void InitSameProcess(widget::CompositorWidget* aWidget, const LayersId& aLayerTreeId);

  mozilla::ipc::IPCResult RecvInitialize(const LayersId& aRootLayerTreeId) override;
  mozilla::ipc::IPCResult RecvGetFrameUniformity(FrameUniformityData* aOutData) override;
  mozilla::ipc::IPCResult RecvWillClose() override;
  mozilla::ipc::IPCResult RecvPause() override;
  mozilla::ipc::IPCResult RecvResume() override;
  mozilla::ipc::IPCResult RecvNotifyChildCreated(const LayersId& child, CompositorOptions* aOptions) override;
  mozilla::ipc::IPCResult RecvMapAndNotifyChildCreated(const LayersId& child, const base::ProcessId& pid, CompositorOptions* aOptions) override;
  mozilla::ipc::IPCResult RecvNotifyChildRecreated(const LayersId& child, CompositorOptions* aOptions) override;
  mozilla::ipc::IPCResult RecvAdoptChild(const LayersId& child) override;
  mozilla::ipc::IPCResult RecvMakeSnapshot(const SurfaceDescriptor& aInSnapshot,
                                           const gfx::IntRect& aRect) override;
  mozilla::ipc::IPCResult RecvFlushRendering() override;
  mozilla::ipc::IPCResult RecvFlushRenderingAsync() override;
  mozilla::ipc::IPCResult RecvWaitOnTransactionProcessed() override;
  mozilla::ipc::IPCResult RecvForcePresent() override;

  mozilla::ipc::IPCResult RecvNotifyRegionInvalidated(const nsIntRegion& aRegion) override;
  mozilla::ipc::IPCResult RecvStartFrameTimeRecording(const int32_t& aBufferSize, uint32_t* aOutStartIndex) override;
  mozilla::ipc::IPCResult RecvStopFrameTimeRecording(const uint32_t& aStartIndex, InfallibleTArray<float>* intervals) override;

  mozilla::ipc::IPCResult RecvCheckContentOnlyTDR(const uint32_t& sequenceNum, bool* isContentOnlyTDR) override { return IPC_OK(); }

  // Unused for chrome <-> compositor communication (which this class does).
  // @see CrossProcessCompositorBridgeParent::RecvRequestNotifyAfterRemotePaint
  mozilla::ipc::IPCResult RecvRequestNotifyAfterRemotePaint() override { return IPC_OK(); };

  mozilla::ipc::IPCResult RecvAllPluginsCaptured() override;

  void ActorDestroy(ActorDestroyReason why) override;

  void ShadowLayersUpdated(LayerTransactionParent* aLayerTree,
                           const TransactionInfo& aInfo,
                           bool aHitTestUpdate) override;
  void ScheduleComposite(LayerTransactionParent* aLayerTree) override;
  bool SetTestSampleTime(const LayersId& aId,
                         const TimeStamp& aTime) override;
  void LeaveTestMode(const LayersId& aId) override;
  void ApplyAsyncProperties(LayerTransactionParent* aLayerTree,
                            TransformsToSkip aSkip) override;
  CompositorAnimationStorage* GetAnimationStorage();
  void SetTestAsyncScrollOffset(const LayersId& aLayersId,
                                const FrameMetrics::ViewID& aScrollId,
                                const CSSPoint& aPoint) override;
  void SetTestAsyncZoom(const LayersId& aLayersId,
                        const FrameMetrics::ViewID& aScrollId,
                        const LayerToParentLayerScale& aZoom) override;
  void FlushApzRepaints(const LayersId& aLayersId) override;
  void GetAPZTestData(const LayersId& aLayersId,
                      APZTestData* aOutData) override;
  void SetConfirmedTargetAPZC(const LayersId& aLayersId,
                              const uint64_t& aInputBlockId,
                              const nsTArray<ScrollableLayerGuid>& aTargets) override;
  AsyncCompositionManager* GetCompositionManager(LayerTransactionParent* aLayerTree) override { return mCompositionManager; }

  PTextureParent* AllocPTextureParent(const SurfaceDescriptor& aSharedData,
                                      const ReadLockDescriptor& aReadLock,
                                      const LayersBackend& aLayersBackend,
                                      const TextureFlags& aFlags,
                                      const LayersId& aId,
                                      const uint64_t& aSerial,
                                      const wr::MaybeExternalImageId& aExternalImageId) override;
  bool DeallocPTextureParent(PTextureParent* actor) override;

  bool IsSameProcess() const override;

  void NotifyWebRenderError(wr::WebRenderError aError);
  void NotifyPipelineRendered(const wr::PipelineId& aPipelineId,
                              const wr::Epoch& aEpoch,
                              TimeStamp& aCompositeStart,
                              TimeStamp& aCompositeEnd);
  RefPtr<AsyncImagePipelineManager> GetAsyncImagePipelineManager() const;

  PCompositorWidgetParent* AllocPCompositorWidgetParent(const CompositorWidgetInitData& aInitData) override;
  bool DeallocPCompositorWidgetParent(PCompositorWidgetParent* aActor) override;

  void ObserveLayerUpdate(LayersId aLayersId, uint64_t aEpoch, bool aActive) override { }

   * This forces the is-first-paint flag to true. This is intended to
   * be called by the widget code when it loses its viewport information
   * (or for whatever reason wants to refresh the viewport information).
   * The information refresh happens because the compositor will call
   * SetFirstPaintViewport on the next frame of composition.
  mozilla::ipc::IPCResult RecvForceIsFirstPaint() override;

  static void SetShadowProperties(Layer* aLayer);

  void NotifyChildCreated(LayersId aChild);

  void AsyncRender();

  // Can be called from any thread
  void ScheduleRenderOnCompositorThread() override;
  void SchedulePauseOnCompositorThread();
  void InvalidateOnCompositorThread();
   * Returns true if a surface was obtained and the resume succeeded; false
   * otherwise.
  bool ScheduleResumeOnCompositorThread();
  bool ScheduleResumeOnCompositorThread(int width, int height);

  void ScheduleComposition();
  void NotifyShadowTreeTransaction(LayersId aId, bool aIsFirstPaint,
      const FocusTarget& aFocusTarget,
      bool aScheduleComposite, uint32_t aPaintSequenceNumber,
      bool aIsRepeatTransaction, bool aHitTestUpdate);

  void UpdatePaintTime(LayerTransactionParent* aLayerTree,
                       const TimeDuration& aPaintTime) override;

   * Check rotation info and schedule a rendering task if needed.
   * Only can be called from compositor thread.
  void ScheduleRotationOnCompositorThread(const TargetConfig& aTargetConfig, bool aIsFirstPaint);

   * Returns the unique layer tree identifier that corresponds to the root
   * tree of this compositor.
  LayersId RootLayerTreeId();

   * Notify local and remote layer trees connected to this compositor that
   * the compositor's local device is being reset. All layers must be
   * invalidated to clear any cached TextureSources.
   * This must be called on the compositor thread.
  void InvalidateRemoteLayers();

   * Returns a pointer to the CompositorBridgeParent corresponding to the given ID.
  static CompositorBridgeParent* GetCompositorBridgeParent(uint64_t id);

   * Notify the compositor for the given layer tree that vsync has occurred.
  static void NotifyVsync(const TimeStamp& aTimeStamp, const LayersId& aLayersId);

   * Set aController as the pan/zoom callback for the subtree referred
   * to by aLayersId.
   * Must run on content main thread.
  static void SetControllerForLayerTree(LayersId aLayersId,
                                        GeckoContentController* aController);

  struct LayerTreeState {
    RefPtr<Layer> mRoot;
    RefPtr<GeckoContentController> mController;
    APZCTreeManagerParent* mApzcTreeManagerParent;
    RefPtr<CompositorBridgeParent> mParent;
    HostLayerManager* mLayerManager;
    RefPtr<WebRenderBridgeParent> mWrBridge;
    // Pointer to the CrossProcessCompositorBridgeParent. Used by APZCs to share
    // their FrameMetrics with the corresponding child process that holds
    // the PCompositorBridgeChild
    CrossProcessCompositorBridgeParent* mCrossProcessParent;
    TargetConfig mTargetConfig;
    LayerTransactionParent* mLayerTree;
    nsTArray<PluginWindowData> mPluginData;
    bool mUpdatedPluginDataAvailable;

    CompositorController* GetCompositorController() const;
    MetricsSharingController* CrossProcessSharingController() const;
    MetricsSharingController* InProcessSharingController() const;
    RefPtr<UiCompositorControllerParent> mUiControllerParent;

   * Lookup the indirect shadow tree for |aId| and return it if it
   * exists.  Otherwise null is returned.  This must only be called on
   * the compositor thread.
  static LayerTreeState* GetIndirectShadowTree(LayersId aId);

   * Lookup the indirect shadow tree for |aId|, call the function object and
   * return true if found. If not found, return false.
  static bool CallWithIndirectShadowTree(
        LayersId aId,
        const std::function<void(LayerTreeState&)>& aFunc);

   * Given the layers id for a content process, get the APZCTreeManagerParent
   * for the corresponding *root* layers id. That is, the APZCTreeManagerParent,
   * if one is found, will always be connected to the parent process rather
   * than a content process. Note that unless the compositor process is
   * separated this is expected to return null, because if the compositor is
   * living in the gecko parent process then there is no APZCTreeManagerParent
   * for the parent process.
  static APZCTreeManagerParent* GetApzcTreeManagerParentForRoot(
        LayersId aContentLayersId);
   * Same as the GetApzcTreeManagerParentForRoot function, but returns
   * the GeckoContentController for the parent process.
  static GeckoContentController* GetGeckoContentControllerForRoot(
        LayersId aContentLayersId);

#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
   * Calculates and requests the main thread update plugin positioning, clip,
   * and visibility via ipc.
  bool UpdatePluginWindowState(LayersId aId);

   * Plugin visibility helpers for the apz (main thread) and compositor
   * thread.
  void ScheduleShowAllPluginWindows() override;
  void ScheduleHideAllPluginWindows() override;
  void ShowAllPluginWindows();
  void HideAllPluginWindows();
  void ScheduleShowAllPluginWindows() override {}
  void ScheduleHideAllPluginWindows() override {}

   * Main thread response for a plugin visibility request made by the
   * compositor thread.
  mozilla::ipc::IPCResult RecvRemotePluginsReady() override;

   * Used by the profiler to denote when a vsync occured
  static void PostInsertVsyncProfilerMarker(mozilla::TimeStamp aVsyncTimestamp);

  widget::CompositorWidget* GetWidget() { return mWidget; }

  void ForceComposeToTarget(gfx::DrawTarget* aTarget, const gfx::IntRect* aRect = nullptr);

  PAPZCTreeManagerParent* AllocPAPZCTreeManagerParent(const LayersId& aLayersId) override;
  bool DeallocPAPZCTreeManagerParent(PAPZCTreeManagerParent* aActor) override;

  // Helper method so that we don't have to expose mApzcTreeManager to
  // CrossProcessCompositorBridgeParent.
  void AllocateAPZCTreeManagerParent(const MonitorAutoLock& aProofOfLayerTreeStateLock,
                                     const LayersId& aLayersId,
                                     LayerTreeState& aLayerTreeStateToUpdate);

  PAPZParent* AllocPAPZParent(const LayersId& aLayersId) override;
  bool DeallocPAPZParent(PAPZParent* aActor) override;

  AndroidDynamicToolbarAnimator* GetAndroidDynamicToolbarAnimator();
  RefPtr<APZSampler> GetAPZSampler();
  RefPtr<APZUpdater> GetAPZUpdater();

  CompositorOptions GetOptions() const {
    return mOptions;

  TimeDuration GetVsyncInterval() const {
    // the variable is called "rate" but really it's an interval
    return mVsyncRate;

  PWebRenderBridgeParent* AllocPWebRenderBridgeParent(const wr::PipelineId& aPipelineId,
                                                      const LayoutDeviceIntSize& aSize,
                                                      TextureFactoryIdentifier* aTextureFactoryIdentifier,
                                                      wr::IdNamespace* aIdNamespace) override;
  bool DeallocPWebRenderBridgeParent(PWebRenderBridgeParent* aActor) override;
  RefPtr<WebRenderBridgeParent> GetWebRenderBridgeParent() const;
  Maybe<TimeStamp> GetTestingTimeStamp() const;

  static CompositorBridgeParent* GetCompositorBridgeParentFromLayersId(const LayersId& aLayersId);
  static RefPtr<CompositorBridgeParent> GetCompositorBridgeParentFromWindowId(const wr::WindowId& aWindowId);

   * This returns a reference to the IAPZCTreeManager "controller subinterface"
   * to which pan/zoom-related events can be sent. The controller subinterface
   * doesn't expose any sampler-thread APZCTreeManager methods.
  static already_AddRefed<IAPZCTreeManager> GetAPZCTreeManager(LayersId aLayersId);

  gfx::IntSize GetEGLSurfaceSize() {
    return mEGLSurfaceSize;
#endif // defined(MOZ_WIDGET_ANDROID)


  void Initialize();

   * Called during destruction in order to release resources as early as possible.
  void StopAndClearResources();

   * Release compositor-thread resources referred to by |aID|.
   * Must run on the content main thread.
  static void DeallocateLayerTreeId(LayersId aId);

  // Protected destructor, to discourage deletion outside of Release():
  virtual ~CompositorBridgeParent();

  void DeferredDestroy();

  PLayerTransactionParent* AllocPLayerTransactionParent(
      const nsTArray<LayersBackend>& aBackendHints,
      const LayersId& aId) override;
  bool DeallocPLayerTransactionParent(PLayerTransactionParent* aLayers) override;
  virtual void ScheduleTask(already_AddRefed<CancelableRunnable>, int);

  void SetEGLSurfaceSize(int width, int height);

  void InitializeLayerManager(const nsTArray<LayersBackend>& aBackendHints);

  void PauseComposition();
  void ResumeComposition();
  void ResumeCompositionAndResize(int width, int height);
  void Invalidate();

  void ForceComposition();
  void CancelCurrentCompositeTask();

  // CompositorVsyncSchedulerOwner
  bool IsPendingComposite() override;
  void FinishPendingComposite() override;
  void CompositeToTarget(gfx::DrawTarget* aTarget, const gfx::IntRect* aRect = nullptr) override;

  bool InitializeAdvancedLayers(const nsTArray<LayersBackend>& aBackendHints,
                                TextureFactoryIdentifier* aOutIdentifier);
  RefPtr<Compositor> NewCompositor(const nsTArray<LayersBackend>& aBackendHints);

   * Add a compositor to the global compositor map.
  static void AddCompositor(CompositorBridgeParent* compositor, uint64_t* id);
   * Remove a compositor from the global compositor map.
  static CompositorBridgeParent* RemoveCompositor(uint64_t id);

   * Creates the global compositor map.
  static void Setup();

   * Destroys the compositor thread and global compositor map.
  static void Shutdown();

   * Finish the shutdown operation on the compositor thread.
  static void FinishShutdown();

   * Return true if current state allows compositing, that is
   * finishing a layers transaction.
  bool CanComposite();

  void DidComposite(LayersId aId, TimeStamp& aCompositeStart, TimeStamp& aCompositeEnd) override;
  void DidComposite(TimeStamp& aCompositeStart, TimeStamp& aCompositeEnd);

  void NotifyDidComposite(TransactionId aTransactionId, TimeStamp& aCompositeStart, TimeStamp& aCompositeEnd);

  // The indirect layer tree lock must be held before calling this function.
  // Callback should take (LayerTreeState* aState, const LayersId& aLayersId)
  template <typename Lambda>
  inline void ForEachIndirectLayerTree(const Lambda& aCallback);

  RefPtr<HostLayerManager> mLayerManager;
  RefPtr<Compositor> mCompositor;
  RefPtr<AsyncCompositionManager> mCompositionManager;
  RefPtr<AsyncImagePipelineManager> mAsyncImageManager;
  RefPtr<WebRenderBridgeParent> mWrBridge;
  widget::CompositorWidget* mWidget;
  Maybe<TimeStamp> mTestTime;
  CSSToLayoutDeviceScale mScale;
  TimeDuration mVsyncRate;

  TransactionId mPendingTransaction;
  TimeStamp mRefreshStartTime;
  TimeStamp mTxnStartTime;
  TimeStamp mFwdTime;

  bool mPaused;

  bool mUseExternalSurfaceSize;
  gfx::IntSize mEGLSurfaceSize;

  CompositorOptions mOptions;

  mozilla::Monitor mPauseCompositionMonitor;
  mozilla::Monitor mResumeCompositionMonitor;

  uint64_t mCompositorBridgeID;
  LayersId mRootLayerTreeID;

  bool mOverrideComposeReadiness;
  RefPtr<CancelableRunnable> mForceCompositionTask;

  RefPtr<APZCTreeManager> mApzcTreeManager;
  RefPtr<APZSampler> mApzSampler;
  RefPtr<APZUpdater> mApzUpdater;

  RefPtr<CompositorVsyncScheduler> mCompositorScheduler;
  // This makes sure the compositorParent is not destroyed before receiving
  // confirmation that the channel is closed.
  // mSelfRef is cleared in DeferredDestroy which is scheduled by ActorDestroy.
  RefPtr<CompositorBridgeParent> mSelfRef;
  RefPtr<CompositorAnimationStorage> mAnimationStorage;

  TimeDuration mPaintTime;

#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
  // cached plugin data used to reduce the number of updates we request.
  LayersId mLastPluginUpdateLayerTreeId;
  nsIntPoint mPluginsLayerOffset;
  nsIntRegion mPluginsLayerVisibleRegion;
  nsTArray<PluginWindowData> mCachedPluginData;
  // Time until which we will block composition to wait for plugin updates.
  TimeStamp mWaitForPluginsUntil;
  // Indicates that we have actually blocked a composition waiting for plugins.
  bool mHaveBlockedForPlugins = false;
  // indicates if plugin window visibility and metric updates are currently
  // being defered due to a scroll operation.
  bool mDeferPluginWindows;
  // indicates if the plugin windows were hidden, and need to be made
  // visible again even if their geometry has not changed.
  bool mPluginWindowsHidden;


} // namespace layers
} // namespace mozilla

#endif // mozilla_layers_CompositorBridgeParent_h