Enforce constant size and device scale factor for surfaces

cc/surfaces/direct_compositor_frame_sink.h

Index: cc/surfaces/direct_compositor_frame_sink.h
diff --git a/cc/surfaces/direct_compositor_frame_sink.h b/cc/surfaces/direct_compositor_frame_sink.h
index 06ac4c3bb15eb7adfd2c95fcf048fcba59e04c3c..54d0d011a6de406234991513e8ae4869d9a10df9 100644
--- a/cc/surfaces/direct_compositor_frame_sink.h
+++ b/cc/surfaces/direct_compositor_frame_sink.h
@@ -76,11 +76,12 @@ class CC_SURFACES_EXPORT DirectCompositorFrameSink
   base::ThreadChecker thread_checker_;
 
   const FrameSinkId frame_sink_id_;
-  LocalSurfaceId delegated_local_surface_id_;
+  LocalSurfaceId local_surface_id_;
   SurfaceManager* surface_manager_;
   LocalSurfaceIdAllocator local_surface_id_allocator_;
   Display* display_;
   gfx::Size last_swap_frame_size_;
+  float device_scale_factor_ = 0.f;

[Fady Samuel, 2017/05/17 00:40:50]

Hmm, so it's starting out invalid? Maybe start it out at 1.f?

[Saman Sami, 2017/05/17 00:55:17]

It'll be updated from the metadata though.

   bool is_lost_ = false;
   std::unique_ptr<ExternalBeginFrameSource> begin_frame_source_;