[Ozone-GBM] Handle GPU crashes

ui/ozone/platform/dri/dri_window_delegate_proxy.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 UI_OZONE_PLATFORM_DRI_DRI_WINDOW_DELEGATE_PROXY_H_
 #define UI_OZONE_PLATFORM_DRI_DRI_WINDOW_DELEGATE_PROXY_H_
 
+#include "ui/gfx/geometry/rect.h"
+#include "ui/ozone/platform/dri/channel_observer.h"
 #include "ui/ozone/platform/dri/dri_window_delegate.h"
 
 namespace ui {
 
 class GpuPlatformSupportHostGbm;
 
 // This is used when running with a GPU process (or with the in-process GPU) to
 // IPC the native window configuration from the browser to the GPU.
-class DriWindowDelegateProxy : public DriWindowDelegate {
+class DriWindowDelegateProxy : public DriWindowDelegate,
+                               public ChannelObserver {
  public:
   DriWindowDelegateProxy(gfx::AcceleratedWidget widget,
                          GpuPlatformSupportHostGbm* sender);
   virtual ~DriWindowDelegateProxy();
 
   // DriWindowDelegate:
   virtual void Initialize() OVERRIDE;
   virtual void Shutdown() OVERRIDE;
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual HardwareDisplayController* GetController() OVERRIDE;
   virtual void OnBoundsChanged(const gfx::Rect& bounds) OVERRIDE;
 
+  // ChannelObserver:
+  virtual void OnChannelEstablished() OVERRIDE;
+  virtual void OnChannelDestroyed() OVERRIDE;
+
  private:
   gfx::AcceleratedWidget widget_;
   GpuPlatformSupportHostGbm* sender_;
+  gfx::Rect bounds_;
+  // Tracks if the connection is established or not.
+  bool has_connection_;
 
   DISALLOW_COPY_AND_ASSIGN(DriWindowDelegateProxy);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_DRI_WINDOW_DELEGATE_PROXY_H_