Added FrameFuture class

content/browser/android/synchronous_compositor_host.h

Index: content/browser/android/synchronous_compositor_host.h
diff --git a/content/browser/android/synchronous_compositor_host.h b/content/browser/android/synchronous_compositor_host.h
index 9cd39a5f654645b828f72c1dfd2687f5a04f8e6d..46af0c90f269e0a357fc7fc57e9ba1dc1e8c8a63 100644
--- a/content/browser/android/synchronous_compositor_host.h
+++ b/content/browser/android/synchronous_compositor_host.h
@@ -11,6 +11,7 @@
 #include <memory>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "cc/output/compositor_frame.h"
@@ -54,11 +55,11 @@ class SynchronousCompositorHost : public SynchronousCompositor {
   ~SynchronousCompositorHost() override;
 
   // SynchronousCompositor overrides.
-  SynchronousCompositor::Frame DemandDrawHw(
+  scoped_refptr<SynchronousCompositor::FrameFuture> 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<SynchronousCompositor::FrameFuture> DemandDrawHwAsync(
       const gfx::Size& viewport_size,
       const gfx::Rect& viewport_rect_for_tile_priority,
       const gfx::Transform& transform_for_tile_priority) override;
@@ -95,7 +96,7 @@ class SynchronousCompositorHost : public SynchronousCompositor {
   bool DemandDrawSwInProc(SkCanvas* canvas);
   void SetSoftwareDrawSharedMemoryIfNeeded(size_t stride, size_t buffer_size);
   void SendZeroMemory();
-  SynchronousCompositor::Frame ProcessHardwareFrame(
+  std::unique_ptr<SynchronousCompositor::Frame> ProcessHardwareFrame(
       uint32_t output_surface_id,
       cc::CompositorFrame compositor_frame);
   bool DemandDrawHwReceiveFrame(const IPC::Message& message);
@@ -111,6 +112,7 @@ class SynchronousCompositorHost : public SynchronousCompositor {
 
   size_t bytes_limit_;
   std::unique_ptr<SharedMemoryWithSize> software_draw_shm_;
+  scoped_refptr<SynchronousCompositor::FrameFuture> frame_future_;
 
   // Updated by both renderer and browser.
   gfx::ScrollOffset root_scroll_offset_;