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

content/browser/renderer_host/delegated_frame_host_client_aura.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 CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_CLIENT_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_CLIENT_AURA_H_
 
 #include "base/macros.h"
 #include "content/browser/renderer_host/delegated_frame_host.h"
 #include "content/common/content_export.h"
@@ skipping 23 matching lines @@
   bool DelegatedFrameCanCreateResizeLock() const override;
   std::unique_ptr<ResizeLock> DelegatedFrameHostCreateResizeLock(
       bool defer_compositor_lock) override;
   void DelegatedFrameHostResizeLockWasReleased() override;
   void DelegatedFrameHostSendReclaimCompositorResources(
       int compositor_frame_sink_id,
       bool is_swap_ack,
       const cc::ReturnedResourceArray& resources) override;
   void SetBeginFrameSource(cc::BeginFrameSource* source) override;
   bool IsAutoResizeEnabled() const override;
+  void ReceivedBadMessage(bad_message::BadMessageReason reason) override;
 
  private:
   RenderWidgetHostViewAura* render_widget_host_view_;
 
   DISALLOW_COPY_AND_ASSIGN(DelegatedFrameHostClientAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_CLIENT_AURA_H_