sync compositor: Signal async frame on IO thread

content/browser/android/synchronous_compositor_host.h

 // Copyright 2015 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_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_
 #define CONTENT_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 41 matching lines @@
       RenderWidgetHostViewAndroid* rwhva,
       WebContents* web_contents);
 
   ~SynchronousCompositorHost() override;
 
   // SynchronousCompositor overrides.
   SynchronousCompositor::Frame DemandDrawHw(
       const gfx::Size& viewport_size,
       const gfx::Rect& viewport_rect_for_tile_priority,
       const gfx::Transform& transform_for_tile_priority) override;
-  void DemandDrawHwAsync(
+  scoped_refptr<FrameFuture> DemandDrawHwAsync(
       const gfx::Size& viewport_size,
       const gfx::Rect& viewport_rect_for_tile_priority,
       const gfx::Transform& transform_for_tile_priority) override;
   bool DemandDrawSw(SkCanvas* canvas) override;
   void ReturnResources(uint32_t compositor_frame_sink_id,
                        const cc::ReturnedResourceArray& resources) override;
   void SetMemoryPolicy(size_t bytes_limit) override;
   void DidChangeRootLayerScrollOffset(
       const gfx::ScrollOffset& root_offset) override;
   void SynchronouslyZoomBy(float zoom_delta, const gfx::Point& anchor) override;
@@ skipping 19 matching lines @@
                             SynchronousCompositorClient* client,
                             bool use_in_proc_software_draw);
   void UpdateFrameMetaData(cc::CompositorFrameMetadata frame_metadata);
   void CompositorFrameSinkCreated();
   bool DemandDrawSwInProc(SkCanvas* canvas);
   void SetSoftwareDrawSharedMemoryIfNeeded(size_t stride, size_t buffer_size);
   void SendZeroMemory();
   SynchronousCompositor::Frame ProcessHardwareFrame(
       uint32_t compositor_frame_sink_id,
       cc::CompositorFrame compositor_frame);
-  bool DemandDrawHwReceiveFrame(const IPC::Message& message);
+  SynchronousCompositorObserver* GetFilter();
 
   RenderWidgetHostViewAndroid* const rwhva_;
   SynchronousCompositorClient* const client_;
   const scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
   const int process_id_;
   const int routing_id_;
-  SynchronousCompositorObserver* const rph_observer_;
   IPC::Sender* const sender_;
   const bool use_in_process_zero_copy_software_draw_;
 
   size_t bytes_limit_;
   std::unique_ptr<SharedMemoryWithSize> software_draw_shm_;
 
   // Updated by both renderer and browser.
   gfx::ScrollOffset root_scroll_offset_;
 
   // From renderer.
   uint32_t renderer_param_version_;
   bool need_animate_scroll_;
   uint32_t need_invalidate_count_;
   uint32_t did_activate_pending_tree_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_