Enforce constant size and device scale factor for surfaces

content/renderer/android/synchronous_compositor_frame_sink.h

Index: content/renderer/android/synchronous_compositor_frame_sink.h
diff --git a/content/renderer/android/synchronous_compositor_frame_sink.h b/content/renderer/android/synchronous_compositor_frame_sink.h
index 579fc717bf384dd926e67154671733fc7ecf788f..7cd006b4c16a12e25ae6d2f74751428e84725b64 100644
--- a/content/renderer/android/synchronous_compositor_frame_sink.h
+++ b/content/renderer/android/synchronous_compositor_frame_sink.h
@@ -101,6 +101,7 @@ class SynchronousCompositorFrameSink
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::LocalSurfaceId& local_surface_id,
                        const gfx::Rect& damage_rect) override;
+  void DidRejectCompositorFrame() override;
 
  private:
   class SoftwareOutputSurface;
@@ -155,6 +156,9 @@ class SynchronousCompositorFrameSink
   std::unique_ptr<cc::LocalSurfaceIdAllocator> local_surface_id_allocator_;
   cc::LocalSurfaceId child_local_surface_id_;
   cc::LocalSurfaceId root_local_surface_id_;
+  gfx::Size child_size_;
+  gfx::Size display_size_;
+  float device_scale_factor_;
   // Uses surface_manager_.
   std::unique_ptr<cc::CompositorFrameSinkSupport> root_support_;
   // Uses surface_manager_.