Enforce constant size and device scale factor for surfaces

ui/aura/local/compositor_frame_sink_local.h

Index: ui/aura/local/compositor_frame_sink_local.h
diff --git a/ui/aura/local/compositor_frame_sink_local.h b/ui/aura/local/compositor_frame_sink_local.h
index 65afe361958dc798b882c6308c7e782cebb15715..c093c1afbbcd39f3a2b55a0532394c1753bd2c93 100644
--- a/ui/aura/local/compositor_frame_sink_local.h
+++ b/ui/aura/local/compositor_frame_sink_local.h
@@ -51,6 +51,7 @@ class CompositorFrameSinkLocal : public cc::CompositorFrameSink,
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::LocalSurfaceId& local_surface_id,
                        const gfx::Rect& damage_rect) override {}
+  void DidRejectCompositorFrame() override;
 
   // cc::ExternalBeginFrameSourceClient:
   void OnNeedsBeginFrames(bool needs_begin_frames) override;
@@ -60,7 +61,8 @@ class CompositorFrameSinkLocal : public cc::CompositorFrameSink,
   const cc::FrameSinkId frame_sink_id_;
   cc::SurfaceManager* const surface_manager_;
   std::unique_ptr<cc::CompositorFrameSinkSupport> support_;
-  gfx::Size last_submitted_frame_size_;
+  gfx::Size surface_size_;
+  float device_scale_factor_ = 0;
   cc::LocalSurfaceIdAllocator id_allocator_;
   cc::LocalSurfaceId local_surface_id_;
   std::unique_ptr<cc::ExternalBeginFrameSource> begin_frame_source_;