cc: Allow the main thread to cancel commits

cc/trees/thread_proxy.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_THREAD_PROXY_H_
 #define CC_TREES_THREAD_PROXY_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 31 matching lines @@
 
   // Proxy implementation
   virtual bool CompositeAndReadback(void* pixels, gfx::Rect rect) OVERRIDE;
   virtual void FinishAllRendering() OVERRIDE;
   virtual bool IsStarted() const OVERRIDE;
   virtual void SetLayerTreeHostClientReady() OVERRIDE;
   virtual void SetVisible(bool visible) OVERRIDE;
   virtual void CreateAndInitializeOutputSurface() OVERRIDE;
   virtual const RendererCapabilities& GetRendererCapabilities() const OVERRIDE;
   virtual void SetNeedsAnimate() OVERRIDE;
+  virtual void SetNeedsUpdateLayers() OVERRIDE;
   virtual void SetNeedsCommit() OVERRIDE;
   virtual void SetNeedsRedraw(gfx::Rect damage_rect) OVERRIDE;
   virtual void SetDeferCommits(bool defer_commits) OVERRIDE;
   virtual bool CommitRequested() const OVERRIDE;
   virtual void MainThreadHasStoppedFlinging() OVERRIDE;
   virtual void Start(scoped_ptr<OutputSurface> first_output_surface) OVERRIDE;
   virtual void Stop() OVERRIDE;
   virtual size_t MaxPartialTextureUpdates() const OVERRIDE;
   virtual void AcquireLayerTextures() OVERRIDE;
   virtual void ForceSerializeOnSwapBuffers() OVERRIDE;
@@ skipping 67 matching lines @@
       scoped_ptr<BeginFrameAndCommitState> begin_frame_state);
   void DidCommitAndDrawFrame();
   void DidCompleteSwapBuffers();
   void SetAnimationEvents(scoped_ptr<AnimationEventsVector> queue,
                           base::Time wall_clock_time);
   void DoCreateAndInitializeOutputSurface();
   // |capabilities| is set only when |success| is true.
   void OnOutputSurfaceInitializeAttempted(
       bool success,
       const RendererCapabilities& capabilities);
+  void SendCommitRequestToImplThreadIfNeeded();
 
   // Called on impl thread.
   struct ReadbackRequest;
   struct CommitPendingRequest;
   struct SchedulerStateRequest;
 
   void ForceCommitOnImplThread(CompletionEvent* completion);
   void StartCommitOnImplThread(
       CompletionEvent* completion,
       ResourceUpdateQueue* queue,
       scoped_refptr<cc::ContextProvider> offscreen_context_provider);
-  void BeginFrameAbortedByMainThreadOnImplThread();
+  void BeginFrameAbortedByMainThreadOnImplThread(bool cancel_commit);
   void RequestReadbackOnImplThread(ReadbackRequest* request);
   void FinishAllRenderingOnImplThread(CompletionEvent* completion);
   void InitializeImplOnImplThread(CompletionEvent* completion);
   void SetLayerTreeHostClientReadyOnImplThread();
   void SetVisibleOnImplThread(CompletionEvent* completion, bool visible);
   void HasInitializedOutputSurfaceOnImplThread(
       CompletionEvent* completion,
       bool* has_initialized_output_surface);
   void InitializeOutputSurfaceOnImplThread(
       CompletionEvent* completion,
@@ skipping 76 matching lines @@
   // Set when the next draw should post DidCommitAndDrawFrame to the main
   // thread.
   bool next_frame_is_newly_committed_frame_on_impl_thread_;
 
   bool throttle_frame_production_;
   bool begin_frame_scheduling_enabled_;
   bool using_synchronous_renderer_compositor_;
 
   bool inside_draw_;
 
+  bool can_cancel_commit_;
+
   bool defer_commits_;
   scoped_ptr<BeginFrameAndCommitState> pending_deferred_commit_;
 
   base::TimeTicks smoothness_takes_priority_expiration_time_;
   bool renew_tree_priority_on_impl_thread_pending_;
 
   RollingTimeDeltaHistory draw_duration_history_;
   RollingTimeDeltaHistory begin_frame_to_commit_duration_history_;
   RollingTimeDeltaHistory commit_to_activate_duration_history_;
 
   // Used for computing samples added to
   // begin_frame_to_commit_draw_duration_history_ and
   // activation_duration_history_.
   base::TimeTicks begin_frame_sent_to_main_thread_time_;
   base::TimeTicks commit_complete_time_;
 
   DISALLOW_COPY_AND_ASSIGN(ThreadProxy);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_THREAD_PROXY_H_