DisplayCompositor should enforce invariant that frame size and device scale factor are fixed

cc/surfaces/compositor_frame_sink_support.h

 // Copyright 2016 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 CC_SURFACES_COMPOSITOR_FRAME_SINK_SUPPORT_H_
 #define CC_SURFACES_COMPOSITOR_FRAME_SINK_SUPPORT_H_
 
 #include <memory>
 #include <unordered_set>
 #include <vector>
@@ skipping 60 matching lines @@
 
   // SurfaceFactoryClient implementation.
   void ReferencedSurfacesChanged(
       const LocalSurfaceId& local_surface_id,
       const std::vector<SurfaceId>* active_referenced_surfaces,
       const std::vector<SurfaceId>* pending_referenced_surfaces) override;
   void ReturnResources(const ReturnedResourceArray& resources) override;
   void SetBeginFrameSource(BeginFrameSource* begin_frame_source) override;
   void WillDrawSurface(const LocalSurfaceId& local_surface_id,
                        const gfx::Rect& damage_rect) override;
+  void OnBadFrameReceived() override;
 
   // BeginFrameObserver implementation.
   void OnBeginFrame(const BeginFrameArgs& args) override;
   const BeginFrameArgs& LastUsedBeginFrameArgs() const override;
   void OnBeginFrameSourcePausedChanged(bool paused) override;
 
   void UpdateNeedsBeginFramesInternal();
 
   CompositorFrameSinkSupportClient* const client_;
 
@@ skipping 38 matching lines @@
   const bool handles_frame_sink_id_invalidation_;
 
   base::WeakPtrFactory<CompositorFrameSinkSupport> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorFrameSinkSupport);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_COMPOSITOR_FRAME_SINK_SUPPORT_H_