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

cc/surfaces/compositor_frame_sink_support.cc

 // 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.
 
 #include "cc/surfaces/compositor_frame_sink_support.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "cc/output/compositor_frame.h"
@@ skipping 186 matching lines @@
   UpdateNeedsBeginFramesInternal();
 }
 
 void CompositorFrameSinkSupport::WillDrawSurface(
     const LocalSurfaceId& local_surface_id,
     const gfx::Rect& damage_rect) {
   if (client_)
     client_->WillDrawSurface(local_surface_id, damage_rect);
 }
 
+void CompositorFrameSinkSupport::OnBadFrameReceived() {
+  if (client_)
+    client_->OnBadFrameReceived();
+}
+
 void CompositorFrameSinkSupport::OnBeginFrame(const BeginFrameArgs& args) {
   UpdateNeedsBeginFramesInternal();
   last_begin_frame_args_ = args;
   if (client_)
     client_->OnBeginFrame(args);
 }
 
 const BeginFrameArgs& CompositorFrameSinkSupport::LastUsedBeginFrameArgs()
     const {
   return last_begin_frame_args_;
@@ skipping 14 matching lines @@
   else
     begin_frame_source_->RemoveObserver(this);
 }
 
 void CompositorFrameSinkSupport::RequestCopyOfSurface(
     std::unique_ptr<CopyOutputRequest> request) {
   surface_factory_.RequestCopyOfSurface(std::move(request));
 }
 
 }  // namespace cc