RendererCompositorFrameSink should handle local surface id allocation

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 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_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 889 matching lines @@
   // drawn after a navigation to a new page has already committed. This is
   // a no-op for non-top-level RenderWidgets, as that should always be zero.
   // TODO(kenrb, fsamuel): We should use SurfaceIDs for this purpose when they
   // are available in the renderer process. See https://crbug.com/695579.
   uint32_t current_content_source_id_;
 
 #if defined(OS_MACOSX)
   std::unique_ptr<device::PowerSaveBlocker> power_save_blocker_;
 #endif
 
+  cc::LocalSurfaceId last_local_surface_id_;
+  gfx::Size last_frame_size_;
+  float last_device_scale_factor_;
+
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_