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

content/browser/renderer_host/delegated_frame_host.h

 // Copyright 2014 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_H_
 #define CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/scheduler/begin_frame_source.h"
 #include "cc/surfaces/compositor_frame_sink_support_client.h"
+#include "content/browser/bad_message.h"
 #include "content/browser/compositor/image_transport_factory.h"
 #include "content/browser/compositor/owned_mailbox.h"
 #include "content/browser/renderer_host/delegated_frame_evictor.h"
 #include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/public/browser/render_process_host.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/compositor_vsync_manager.h"
@@ skipping 44 matching lines @@
       bool defer_compositor_lock) = 0;
   virtual void DelegatedFrameHostResizeLockWasReleased() = 0;
 
   virtual void DelegatedFrameHostSendReclaimCompositorResources(
       int compositor_frame_sink_id,
       bool is_swap_ack,
       const cc::ReturnedResourceArray& resources) = 0;
 
   virtual void SetBeginFrameSource(cc::BeginFrameSource* source) = 0;
   virtual bool IsAutoResizeEnabled() const = 0;
+
+  virtual void ReceivedBadMessage(bad_message::BadMessageReason reason) {}
 };
 
 // The DelegatedFrameHost is used to host all of the RenderWidgetHostView state
 // and functionality that is associated with delegated frames being sent from
 // the RenderWidget. The DelegatedFrameHost will push these changes through to
 // the ui::Compositor associated with its DelegatedFrameHostClient.
 class CONTENT_EXPORT DelegatedFrameHost
     : public ui::CompositorObserver,
       public ui::CompositorVSyncManager::Observer,
       public ui::ContextFactoryObserver,
@@ skipping 23 matching lines @@
 
   // DelegatedFrameEvictorClient implementation.
   void EvictDelegatedFrame() override;
 
   // cc::CompositorFrameSinkSupportClient implementation.
   void DidReceiveCompositorFrameAck() override;
   void OnBeginFrame(const cc::BeginFrameArgs& args) override;
   void ReclaimResources(const cc::ReturnedResourceArray& resources) override;
   void WillDrawSurface(const cc::LocalSurfaceId& id,
                        const gfx::Rect& damage_rect) override;
+  void OnBadFrameReceived() override;
 
   // Public interface exposed to RenderWidgetHostView.
 
   void SwapDelegatedFrame(uint32_t compositor_frame_sink_id,
                           cc::CompositorFrame frame);
   void ClearDelegatedFrame();
   void WasHidden();
   void WasShown(const ui::LatencyInfo& latency_info);
   void WasResized();
   bool HasSavedFrame();
@@ skipping 205 matching lines @@
   bool needs_begin_frame_ = false;
 
   bool has_frame_ = false;
 
   std::unique_ptr<DelegatedFrameEvictor> delegated_frame_evictor_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_HOST_H_