author Bobby Holley <>
Thu, 16 Jul 2015 15:50:07 -0700
changeset 253943 7b078b5605a1bc51ba7fb87b5b81f46f9e8dfad1
parent 253902 6f0dd2df343f42e59d4653a5669a955e0f50ded3
child 255377 1199933ae78ca2294d7e19015d566b23bc8e52b2
permissions -rw-r--r--
Bug 1161831 - Factor the sharable bits out of nsIResProtocolHandler. r=billm

/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 8 -*- */
/* vim: set sw=4 ts=8 et tw=80 ft=cpp : */
/* 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 */

include protocol PAsmJSCacheEntry;
include protocol PBackground;
include protocol PBlob;
include protocol PBluetooth;
include protocol PBrowser;
include protocol PCellBroadcast;
include protocol PCompositor;
include protocol PContentBridge;
include protocol PContentPermissionRequest;
include protocol PCycleCollectWithLogs;
include protocol PCrashReporter;
include protocol PPSMContentDownloader;
include protocol PExternalHelperApp;
include protocol PDeviceStorageRequest;
include protocol PFileDescriptorSet;
include protocol PFMRadio;
include protocol PFileSystemRequest;
include protocol PHal;
include protocol PIcc;
include protocol PProcessHangMonitor;
include protocol PImageBridge;
include protocol PMedia;
include protocol PMemoryReportRequest;
include protocol PMobileConnection;
include protocol PNecko;
// FIXME This is pretty ridiculous, but we have to keep the order of the
//       following 4 includes, or the parser is confused about PGMPContent
//       bridging PContent and PGMP. As soon as it registers the bridge between
//       PContent and PPluginModule it seems to think that PContent's parent and
//       child live in the same process!
include protocol PGMPContent;
include protocol PGMPService;
include protocol PPluginModule;
include protocol PGMP;
include protocol PPrinting;
include protocol POfflineCacheUpdate;
include protocol PScreenManager;
include protocol PSharedBufferManager;
include protocol PSms;
include protocol PSpeechSynthesis;
include protocol PStorage;
include protocol PTelephony;
include protocol PTestShell;
include protocol PVoicemail;
include protocol PJavaScript;
include protocol PRemoteSpellcheckEngine;
include protocol PWebrtcGlobal;
include DOMTypes;
include JavaScriptTypes;
include InputStreamParams;
include PTabContext;
include URIParams;
include PluginTypes;
include ProtocolTypes;
include PContentPermission;
include BrowserConfiguration;

// Workaround to prevent error if PContentChild.cpp & PContentBridgeParent.cpp
// are put into different UnifiedProtocolsXX.cpp files.
// XXX Remove this once bug 1069073 is fixed
include "mozilla/dom/PContentBridgeParent.h";

include "mozilla/dom/indexedDB/SerializationHelpers.h";

using GeoPosition from "nsGeoPositionIPCSerialiser.h";

using struct ChromePackage from "mozilla/chrome/RegistryMessageUtils.h";
using struct SubstitutionMapping from "mozilla/chrome/RegistryMessageUtils.h";
using struct OverrideMapping from "mozilla/chrome/RegistryMessageUtils.h";
using base::ChildPrivileges from "base/process_util.h";
using base::ProcessId from "base/process.h";
using struct IPC::Permission from "mozilla/net/NeckoMessageUtils.h";
using class IPC::Principal from "mozilla/dom/PermissionMessageUtils.h";
using struct mozilla::null_t from "ipc/IPCMessageUtils.h";
using struct mozilla::void_t from "ipc/IPCMessageUtils.h";
using mozilla::dom::asmjscache::OpenMode from "mozilla/dom/asmjscache/AsmJSCache.h";
using mozilla::dom::asmjscache::WriteParams from "mozilla/dom/asmjscache/AsmJSCache.h";
using mozilla::dom::NativeThreadId from "mozilla/dom/TabMessageUtils.h";
using mozilla::dom::quota::PersistenceType from "mozilla/dom/quota/PersistenceType.h";
using mozilla::hal::ProcessPriority from "mozilla/HalTypes.h";
using gfxIntSize from "nsSize.h";
using mozilla::dom::TabId from "mozilla/dom/ipc/IdType.h";
using mozilla::dom::ContentParentId from "mozilla/dom/ipc/IdType.h";
using struct LookAndFeelInt from "mozilla/widget/WidgetMessageUtils.h";
using struct mozilla::OwningSerializedStructuredCloneBuffer from "ipc/IPCMessageUtils.h";

union ChromeRegistryItem

namespace mozilla {
namespace dom {

struct FontListEntry {
    nsString  familyName;
    nsString  faceName;
    nsCString filepath;
    uint16_t  weight;
    int16_t   stretch;
    uint8_t   italic;
    uint8_t   index;
    bool      isHidden;

struct DeviceStorageFreeSpaceParams
  nsString type;
  nsString storageName;

struct DeviceStorageUsedSpaceParams
  nsString type;
  nsString storageName;

struct DeviceStorageAvailableParams
  nsString type;
  nsString storageName;

struct DeviceStorageStatusParams
  nsString type;
  nsString storageName;

struct DeviceStorageFormatParams
  nsString type;
  nsString storageName;

struct DeviceStorageMountParams
  nsString type;
  nsString storageName;

struct DeviceStorageUnmountParams
  nsString type;
  nsString storageName;

struct DeviceStorageAddParams
  nsString type;
  nsString storageName;
  nsString relpath;
  PBlob blob;

struct DeviceStorageAppendParams
  nsString type;
  nsString storageName;
  nsString relpath;
  PBlob blob;

struct DeviceStorageCreateFdParams
  nsString type;
  nsString storageName;
  nsString relpath;

struct DeviceStorageGetParams
  nsString type;
  nsString storageName;
  nsString rootDir;
  nsString relpath;

struct DeviceStorageDeleteParams
  nsString type;
  nsString storageName;
  nsString relpath;

struct DeviceStorageEnumerationParams
  nsString type;
  nsString storageName;
  nsString rootdir;
  uint64_t since;

union DeviceStorageParams

struct FMRadioRequestEnableParams
  double frequency;

struct FMRadioRequestDisableParams


struct FMRadioRequestSetFrequencyParams
  double frequency;

struct FMRadioRequestSeekParams
  bool upward;

struct FMRadioRequestCancelSeekParams


union FMRadioRequestParams

struct FileSystemCreateDirectoryParams
  nsString filesystem;
  nsString realPath;

union FileSystemFileDataValue

struct FileSystemCreateFileParams
  nsString filesystem;
  nsString realPath;
  FileSystemFileDataValue data;
  bool replace;

struct FileSystemGetDirectoryListingParams
  nsString filesystem;
  nsString realPath;

struct FileSystemGetFileOrDirectoryParams
  nsString filesystem;
  nsString realPath;

union FileSystemPathOrFileValue

struct FileSystemRemoveParams
  nsString filesystem;
  nsString directory;
  FileSystemPathOrFileValue target;
  bool recursive;

union FileSystemParams

union PrefValue {

union MaybePrefValue {

struct PrefSetting {
  nsCString name;
  MaybePrefValue defaultValue;
  MaybePrefValue userValue;

struct DataStoreSetting {
  nsString name;
  nsString originURL;
  nsString manifestURL;
  bool readOnly;
  bool enabled;

// Note: Any changes to this structure should also be changed in
// FileSystemUpdate below.
struct VolumeInfo {
  nsString name;
  nsString mountPoint;
  int32_t volState;
  int32_t mountGeneration;
  bool isMediaPresent;
  bool isSharing;
  bool isFormatting;
  bool isFake;
  bool isUnmounting;
  bool isRemovable;
  bool isHotSwappable;

struct ClipboardCapabilities {
  bool supportsSelectionClipboard;
  bool supportsFindClipboard;

union MaybeFileDesc {

union FileDescOrError {

union OptionalContentId

struct DomainPolicyClone
    bool        active;
    URIParams[] blacklist;
    URIParams[] whitelist;
    URIParams[] superBlacklist;
    URIParams[] superWhitelist;

struct GamepadAdded {
    nsString id;
    uint32_t index;
    uint32_t mapping;
    uint32_t num_buttons;
    uint32_t num_axes;

struct GamepadRemoved {
    uint32_t index;

struct GamepadAxisInformation {
    uint32_t index;
    uint32_t axis;
    double value;

struct GamepadButtonInformation {
    uint32_t index;
    uint32_t button;
    bool pressed;
    double value;

union GamepadChangeEvent {

prio(normal upto urgent) sync protocol PContent
    parent spawns PPluginModule;

    parent opens PCompositor;
    parent opens PProcessHangMonitor;
    parent opens PSharedBufferManager;
    parent opens PImageBridge;
    parent opens PGMPService;
    child opens PBackground;

    manages PAsmJSCacheEntry;
    manages PBlob;
    manages PBluetooth;
    manages PBrowser;
    manages PCellBroadcast;
    manages PContentPermissionRequest;
    manages PCrashReporter;
    manages PCycleCollectWithLogs;
    manages PDeviceStorageRequest;
    manages PFileSystemRequest;
    manages PPSMContentDownloader;
    manages PExternalHelperApp;
    manages PFileDescriptorSet;
    manages PFMRadio;
    manages PHal;
    manages PIcc;
    manages PMedia;
    manages PMemoryReportRequest;
    manages PMobileConnection;
    manages PNecko;
    manages POfflineCacheUpdate;
    manages PPrinting;
    manages PScreenManager;
    manages PSms;
    manages PSpeechSynthesis;
    manages PStorage;
    manages PTelephony;
    manages PTestShell;
    manages PVoicemail;
    manages PJavaScript;
    manages PRemoteSpellcheckEngine;
    manages PWebrtcGlobal;

    // Depending on exactly how the new browser is being created, it might be
    // created from either the child or parent process!
    // The child creates the PBrowser as part of
    // TabChild::BrowserFrameProvideWindow (which happens when the child's
    // content calls, and the parent creates the PBrowser as part
    // of ContentParent::CreateBrowserOrApp.
    // When the parent constructs a PBrowser, the child trusts the app token it
    // receives from the parent.  In that case, context can be any of the
    // IPCTabContext subtypes.
    // When the child constructs a PBrowser, the parent doesn't trust the app
    // token it receives from the child.  In this case, context must have type
    // PopupIPCTabContext.  The browser created using a PopupIPCTabContext has
    // the opener PBrowser's app-id and containing-app-id.  The parent checks
    // that if the opener is a browser element, the context is also for a
    // browser element.
    // This allows the parent to prevent a malicious child from escalating its
    // privileges by requesting a PBrowser corresponding to a highly-privileged
    // app; the child can only request privileges for an app which the child has
    // access to (in the form of a TabChild).
    // Keep the last 3 attributes in sync with GetProcessAttributes!
    async PBrowser(TabId tabId, IPCTabContext context, uint32_t chromeFlags,
                   ContentParentId cpId, bool isForApp, bool isForBrowser);

    async PBlob(BlobConstructorParams params);

    PFileDescriptorSet(FileDescriptor fd);

     * Enable system-level sandboxing features, if available.  Can
     * usually only be performed zero or one times.  The child may
     * abnormally exit if this fails; the details are OS-specific.
    async SetProcessSandbox();

    PMemoryReportRequest(uint32_t generation, bool anonymize,
                         bool minimizeMemoryUsage, MaybeFileDesc DMDFile);

    async SpeakerManagerNotify();

     * Communication between the PuppetBidiKeyboard and the actual
     * BidiKeyboard hosted by the parent
    async BidiKeyboardNotify(bool isLangRTL);

    async UpdateServiceWorkerRegistrations();

    async DataStoreNotify(uint32_t aAppId, nsString aName,
                          nsString aManifestURL);

     * Dump this process's GC and CC logs to the provided files.
     * For documentation on the other args, see dumpGCAndCCLogsToFile in
     * nsIMemoryInfoDumper.idl
    PCycleCollectWithLogs(bool dumpAllTraces,
                          FileDescriptor gcLog,
                          FileDescriptor ccLog);


    RegisterChrome(ChromePackage[] packages, SubstitutionMapping[] substitutions,
                   OverrideMapping[] overrides, nsCString locale, bool reset);
    RegisterChromeItem(ChromeRegistryItem item);

    async SetOffline(bool offline);
    async SetConnectivity(bool connectivity);

    async NotifyVisited(URIParams uri);

    async SystemMemoryAvailable(uint64_t getterId, uint32_t memoryAvailable);

    PreferenceUpdate(PrefSetting pref);

    NotifyAlertsObserver(nsCString topic, nsString data);

    GeolocationUpdate(GeoPosition somewhere);

    GeolocationError(uint16_t errorCode);

    UpdateDictionaryList(nsString[] dictionaries);

    // nsIPermissionManager messages
    AddPermission(Permission permission);

    ScreenSizeChanged(gfxIntSize size);

    Volumes(VolumeInfo[] volumes);

    FlushMemory(nsString reason);


     * Start accessibility engine in content process.

    AppInfo(nsCString version, nsCString buildID, nsCString name, nsCString UAName,
            nsCString ID, nsCString vendor);

    // Notify child that last-pb-context-exited notification was observed

    FilePathUpdate(nsString storageType, nsString storageName, nsString filepath,
                   nsCString reasons);

    // Note: Any changes to this structure should also be changed in
    // VolumeInfo above.
    FileSystemUpdate(nsString fsName, nsString mountPoint, int32_t fsState,
                     int32_t mountGeneration, bool isMediaPresent,
                     bool isSharing, bool isFormatting, bool isFake,
                     bool isUnmounting, bool isRemovable, bool isHotSwappable);

    // Notify volume is removed.
    VolumeRemoved(nsString fsName);

    // Ask the Nuwa process to create a new child process.

    NotifyProcessPriorityChanged(ProcessPriority priority);

     * Used to manage nsIStyleSheetService across processes.
    async LoadAndRegisterSheet(URIParams uri, uint32_t type);
    async UnregisterSheet(URIParams uri, uint32_t type);

    NotifyPhoneStateChange(nsString newState);

     * Notify idle observers in the child
    NotifyIdleObserver(uint64_t observerId, nsCString topic, nsString str);

     * Notify windows in the child to apply a new app style.

     * Called during plugin initialization to map a plugin id to a child process
     * id.
    async AssociatePluginId(uint32_t aPluginId, ProcessId aProcessId);

     * This call is used by async plugin initialization to notify the
     * PluginModuleContentParent that the PluginModuleChromeParent's async
     * init has completed.
    async LoadPluginResult(uint32_t aPluginId, bool aResult);

     * Control the Gecko Profiler in the child process.
    async StartProfiler(uint32_t aEntries, double aInterval, nsCString[] aFeatures,
                        nsCString[] aThreadNameFilters);
    async StopProfiler();
    async PauseProfiler(bool aPause);

    async GatherProfile();

    InvokeDragSession(IPCDataTransfer[] transfers, uint32_t action);

    EndDragSession(bool aDoneDrag, bool aUserCancelled);

    async DomainSetChanged(uint32_t aSetType, uint32_t aChangeType, OptionalURIParams aDomain);

     * Notify the child to shutdown. The child will in turn call FinishShutdown
     * and let the parent close the channel.
    async Shutdown();

    async LoadProcessScript(nsString url);

     * Requests a full native update of a native plugin child window. This is
     * a Windows specific call.
    async UpdateWindow(uintptr_t aChildId);

     * Send gamepad status update to child.
    GamepadUpdate(GamepadChangeEvent aGamepadEvent);
     * Tell the content process some attributes of itself.  This is
     * among the first information queried by content processes after
     * startup.  (The message is sync to allow the content process to
     * control when it receives the information.)
     * |id| is a unique ID among all subprocesses.  When |isForApp &&
     * isForBrowser|, we're loading <browser> for an app.  When
     * |isForBrowser|, we're loading <browser>.  When |!isForApp &&
     * !isForBrowser|, we're probably loading <xul:browser remote>.
     * Keep the return values in sync with PBrowser()!
    sync GetProcessAttributes()
        returns (ContentParentId cpId, bool isForApp, bool isForBrowser);
    sync GetXPCOMProcessAttributes()
        returns (bool isOffline, bool isConnected, bool isLangRTL, nsString[] dictionaries,
                 ClipboardCapabilities clipboardCaps,
                 DomainPolicyClone domainPolicy,
                 OwningSerializedStructuredCloneBuffer initialData);

    sync CreateChildProcess(IPCTabContext context,
                            ProcessPriority priority,
                            TabId openerTabId)
        returns (ContentParentId cpId, bool isForApp, bool isForBrowser, TabId tabId);
    sync BridgeToChildProcess(ContentParentId cpId);

    async CreateGMPService();
    sync GetGMPPluginVersionForAPI(nsCString api, nsCString[] tags)
        returns (bool hasPlugin, nsCString version);

     * This call connects the content process to a plugin process. While this
     * call runs, a new PluginModuleParent will be created in the ContentChild
     * via bridging. The corresponding PluginModuleChild will live in the plugin
     * process.
    sync LoadPlugin(uint32_t aPluginId) returns (nsresult aResult, uint32_t aRunID);

     * This call is used by asynchronous plugin instantiation to notify the
     * content parent that it is now safe to initiate the plugin bridge for
     * the specified plugin id. When this call returns, the requested bridge
     * connection has been made.
    sync ConnectPluginBridge(uint32_t aPluginId) returns (nsresult rv);

     * Return the current blocklist state for a particular plugin.
    sync GetBlocklistState(uint32_t aPluginId) returns (uint32_t aState);

     * This call returns the set of plugins loaded in the chrome
     * process. However, in many cases this set will not have changed since the
     * last FindPlugins message. Consequently, the chrome process increments an
     * epoch number every time the set of plugins changes. The content process
     * sends up the last epoch it observed. If the epochs are the same, the
     * chrome process returns no plugins. Otherwise it returns a complete list.
     * |pluginEpoch| is the epoch last observed by the content
     * process. |newPluginEpoch| is the current epoch in the chrome process. If
     * |pluginEpoch == newPluginEpoch|, then |plugins| will be left empty.
    sync FindPlugins(uint32_t pluginEpoch) returns (PluginTag[] plugins, uint32_t newPluginEpoch);

    async PJavaScript();

    PDeviceStorageRequest(DeviceStorageParams params);

    PFileSystemRequest(FileSystemParams params);

    sync PCrashReporter(NativeThreadId tid, uint32_t processType);

    prio(urgent) sync GetRandomValues(uint32_t length)
        returns (uint8_t[] randomValues);

    async GetSystemMemory(uint64_t getterId);

    sync IsSecureURI(uint32_t type, URIParams uri, uint32_t flags)
        returns (bool isSecureURI);

    sync GetLookAndFeelCache()
        returns (LookAndFeelInt[] lookAndFeelIntCache);

    prio(urgent) async PHal();

    PIcc(uint32_t serviceId);

    PMobileConnection(uint32_t clientId);



    prio(high) sync PScreenManager()
        returns (uint32_t numberOfScreens,
                 float systemDefaultScale,
                 bool success);




    prio(urgent) async PStorage();






    PAsmJSCacheEntry(OpenMode openMode, WriteParams write, Principal principal);


    // Services remoting

    async StartVisitedQuery(URIParams uri);
    async VisitURI(URIParams uri, OptionalURIParams referrer, uint32_t flags);
    async SetURITitle(URIParams uri, nsString title);

    async LoadURIExternal(URIParams uri);

    // PrefService message
    sync ReadPrefsArray() returns (PrefSetting[] prefs);

    sync ReadFontList() returns (FontListEntry[] retValue);

    sync SyncMessage(nsString aMessage, ClonedMessageData aData,
                     CpowEntry[] aCpows, Principal aPrincipal)
      returns (OwningSerializedStructuredCloneBuffer[] retval);

    prio(high) sync RpcMessage(nsString aMessage, ClonedMessageData aData,
                               CpowEntry[] aCpows, Principal aPrincipal)
      returns (OwningSerializedStructuredCloneBuffer[] retval);

    ShowAlertNotification(nsString imageUrl,
                          nsString title,
                          nsString text,
                          bool textClickable,
                          nsString cookie,
                          nsString name,
                          nsString bidi,
                          nsString lang,
                          nsString data,
                          Principal principal,
                          bool inPrivateBrowsing);

    CloseAlert(nsString name, Principal principal);

    PPSMContentDownloader(uint32_t aCertType);

    PExternalHelperApp(OptionalURIParams uri,
                       nsCString aMimeContentType,
                       nsCString aContentDisposition,
                       uint32_t aContentDispositionHint,
                       nsString aContentDispositionFilename,
                       bool aForceSave,
                       int64_t aContentLength,
                       OptionalURIParams aReferrer,
                       nullable PBrowser aBrowser);

    AddGeolocationListener(Principal principal, bool highAccuracy);
    SetGeolocationHigherAccuracy(bool enable);

    ConsoleMessage(nsString message);
    ScriptError(nsString message, nsString sourceName, nsString sourceLine,
                uint32_t lineNumber, uint32_t colNumber, uint32_t flags,
                nsCString category);

    // nsIPermissionManager messages
    sync ReadPermissions() returns (Permission[] permissions);

    // Places the items within dataTransfer on the clipboard.
    SetClipboard(IPCDataTransfer aDataTransfer,
                 bool aIsPrivateData,
                 int32_t aWhichClipboard);

    // Given a list of supported types, returns the clipboard data for the
    // first type that matches.
    sync GetClipboard(nsCString[] aTypes, int32_t aWhichClipboard)
        returns (IPCDataTransfer dataTransfer);

    // Clears the clipboard.
    EmptyClipboard(int32_t aWhichClipboard);

    // Returns true if data of one of the specified types is on the clipboard.
    sync ClipboardHasType(nsCString[] aTypes, int32_t aWhichClipboard)
        returns (bool hasType);

    sync GetSystemColors(uint32_t colorsCount)
        returns (uint32_t[] colors);

    sync GetIconForExtension(nsCString aFileExt, uint32_t aIconSize)
        returns (uint8_t[] bits);

    sync GetShowPasswordSetting()
        returns (bool showPassword);

    // Notify the parent of the presence or absence of private docshells
    PrivateDocShellsExist(bool aExist);

    // Tell the parent that the child has gone idle for the first time
    async FirstIdle();

    async AudioChannelServiceStatus(bool aActiveTelephonyChannel,
                                    bool aContentOrNormalChannel,
                                    bool aAnyActiveChannel);

    async AudioChannelChangeDefVolChannel(int32_t aChannel, bool aHidden);

    sync DataStoreGetStores(nsString aName, nsString aOwner, Principal aPrincipal)
        returns (DataStoreSetting[] dataStores);

    async FilePathUpdateNotify(nsString aType,
                               nsString aStorageName,
                               nsString aFilepath,
                               nsCString aReason);

    // Notify the parent that the child has finished handling a system message.
    async SystemMessageHandled();


    sync AddNewProcess(uint32_t pid, ProtocolFdMapping[] aFds);

    // called by the child (test code only) to propagate volume changes to the parent
    async CreateFakeVolume(nsString fsName, nsString mountPoint);
    async SetFakeVolumeState(nsString fsName, int32_t fsState);
    async RemoveFakeVolume(nsString fsName);

    sync KeywordToURI(nsCString keyword)
        returns (nsString providerName, OptionalInputStreamParams postData, OptionalURIParams uri);

    sync NotifyKeywordSearchLoading(nsString providerName, nsString keyword);

    async CopyFavicon(URIParams oldURI, URIParams newURI, bool isPrivate);

    // Tell the compositor to allocate a layer tree id for nested remote mozbrowsers.
    sync AllocateLayerTreeId()
        returns (uint64_t id);
    async DeallocateLayerTreeId(uint64_t id);

    sync SpeakerManagerForceSpeaker(bool aEnable);

    sync SpeakerManagerGetSpeakerStatus()
        returns (bool value);

     * Notifies the parent about a recording device is starting or shutdown.
     * @param recordingStatus starting or shutdown
     * @param pageURL URL that request that changing the recording status
     * @param isAudio recording start with microphone
     * @param isVideo recording start with camera
    async RecordingDeviceEvents(nsString recordingStatus,
                                nsString pageURL,
                                bool isAudio,
                                bool isVideo);

    sync GetGraphicsFeatureStatus(int32_t aFeature) returns (int32_t aStatus, bool aSuccess);

    AddIdleObserver(uint64_t observerId, uint32_t idleTimeInS);
    RemoveIdleObserver(uint64_t observerId, uint32_t idleTimeInS);

     * This message is only used on X11 platforms.
     * Send a dup of the plugin process's X socket to the parent
     * process.  In theory, this scheme keeps the plugin's X resources
     * around until after both the plugin process shuts down *and* the
     * parent process closes the dup fd.  This is used to prevent the
     * parent process from crashing on X errors if, e.g., the plugin
     * crashes *just before* a repaint and the parent process tries to
     * use the newly-invalid surface.
    BackUpXResources(FileDescriptor aXSocketFd);

    sync OpenAnonymousTemporaryFile() returns (FileDescOrError aFD);

     * Keygen requires us to call it after a <keygen> element is parsed and
     * before one is submitted. This is urgent because an extension might use
     * a CPOW to synchronously submit a keygen element.
    prio(urgent) sync KeygenProcessValue(nsString oldValue,
                                         nsString challenge,
                                         nsString keytype,
                                         nsString keyparams)
        returns (nsString newValue);

     * Called to provide the options for <keygen> elements.
    sync KeygenProvideContent()
        returns (nsString aAttribute, nsString[] aContent);

    // Use only for testing!
    sync GetFileReferences(PersistenceType persistenceType,
                           nsCString origin,
                           nsString databaseName,
                           int64_t fileId)
      returns (int32_t refCnt, int32_t dBRefCnt, int32_t sliceRefCnt,
               bool result);

    // Use only for testing!

     * Tell the chrome process there is an creation of PBrowser.
     * return a system-wise unique Id.
    sync AllocateTabId(TabId openerTabId, IPCTabContext context, ContentParentId cpId)
        returns (TabId tabId);
    async DeallocateTabId(TabId tabId);

     * Starts an offline application cache update.
     * @param manifestURI
     *   URI of the manifest to fetch, the application cache group ID
     * @param documentURI
     *   URI of the document that referred the manifest
     * @param stickDocument
     *   True if the update was initiated by a document load that referred
     *   a manifest.
     *   False if the update was initiated by applicationCache.update() call.
     *   Tells the update to carry the documentURI to a potential separate
     *   update of implicit (master) items.
     *   Why this argument? If the document was not found in an offline cache
     *   before load and refers a manifest and this manifest itself has not
     *   been changed since the last fetch, we will not do the application
     *   cache group update. But we must cache the document (identified by the
     *   documentURI). This argument will ensure that a previously uncached
     *   document will get cached and that we don't re-cache a document that
     *   has already been cached (stickDocument=false).
     * @param tabId
     *   To identify which tab owns the app.
    POfflineCacheUpdate(URIParams manifestURI, URIParams documentURI,
                        bool stickDocument, TabId tabId);

     * Sets "offline-app" permission for the principal.  Called when we hit
     * a web app with the manifest attribute in <html> and
     * offline-apps.allow_by_default is set to true.
    SetOfflinePermission(Principal principal);

     * Notifies the parent to continue shutting down after the child performs
     * its shutdown tasks.
    async FinishShutdown();

    UpdateDropEffect(uint32_t aDragAction, uint32_t aDropEffect);

     * Initiates an asynchronous request for permission for the
     * provided principal.
     * @param aRequests
     *   The array of permissions to request.
     * @param aPrincipal
     *   The principal of the request.
     * @param tabId
     *   To identify which tab issues this request.
     * NOTE: The principal is untrusted in the parent process. Only
     *       principals that can live in the content process should
     *       provided.
    PContentPermissionRequest(PermissionRequest[] aRequests, Principal aPrincipal,
                              TabId tabId);

     * Send ServiceWorkerRegistrationData to child process.
    sync GetBrowserConfiguration(nsCString aUri)
        returns (BrowserConfiguration aConfig);

     * Tells the parent to start the gamepad listening service if it hasn't already.

     * Tells the parent to stop the gamepad listening service if it hasn't already.

    async Profile(nsCString aProfile);

     AsyncMessage(nsString aMessage, ClonedMessageData aData,
                  CpowEntry[] aCpows, Principal aPrincipal);