Move fallback tick handling to compositor thread

content/renderer/android/synchronous_compositor_output_surface.h

 // Copyright 2013 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 CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
 #define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_
 
 #include <stddef.h>
 
 #include <vector>
 
 #include "base/callback.h"
+#include "base/cancelable_callback.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/managed_memory_policy.h"
 #include "cc/output/output_surface.h"
 #include "ipc/ipc_message.h"
 #include "ui/gfx/transform.h"
@@ skipping 73 matching lines @@
  private:
   class SoftwareDevice;
   friend class SoftwareDevice;
 
   void InvokeComposite(const gfx::Transform& transform,
                        const gfx::Rect& viewport,
                        const gfx::Rect& clip,
                        bool hardware_draw);
   bool CalledOnValidThread() const;
 
+  void CancelFallbackTick();
+  void FallbackTickFired();
+
   const int routing_id_;
   SynchronousCompositorRegistry* const registry_;  // unowned
   bool registered_;
 
   // Not owned.
   SynchronousCompositorOutputSurfaceClient* sync_client_;
 
   // Only valid (non-NULL) during a DemandDrawSw() call.
   SkCanvas* current_sw_canvas_;
 
   cc::ManagedMemoryPolicy memory_policy_;
   bool did_swap_;
   scoped_refptr<FrameSwapMessageQueue> frame_swap_message_queue_;
 
+  base::CancelableClosure fallback_tick_;
+  bool fallback_tick_pending_;
+  bool fallback_tick_running_;
+
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorOutputSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_OUTPUT_SURFACE_H_