sync compositor: Signal async frame on IO thread

content/public/test/test_synchronous_compositor_android.h

 // Copyright 2014 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_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_
 #define CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 10 matching lines @@
   TestSynchronousCompositor(int process_id, int routing_id);
   ~TestSynchronousCompositor() override;
 
   void SetClient(SynchronousCompositorClient* client);
 
   // 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;
   void ReturnResources(uint32_t compositor_frame_sink_id,
                        const cc::ReturnedResourceArray& resources) override;
   bool DemandDrawSw(SkCanvas* canvas) override;
   void SetMemoryPolicy(size_t bytes_limit) override {}
   void DidChangeRootLayerScrollOffset(
       const gfx::ScrollOffset& root_offset) override {}
   void SynchronouslyZoomBy(float zoom_delta,
@@ skipping 20 matching lines @@
   const int routing_id_;
   SynchronousCompositor::Frame hardware_frame_;
   FrameAckArray frame_ack_array_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSynchronousCompositor);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_TEST_TEST_SYNCHRONOUS_COMPOSITOR_ANDROID_H_