[Ozone-DRI] Do proper bounds checks when moving the cursor

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"
@@ skipping 17 matching lines @@
   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_;
+  GpuPlatformSupportHostGbm* sender_;  // Not owned.
+
+  // Cached state for the window. If the GPU process crashes, this state is used
+  // to update the GPU side when it comes back.
   gfx::Rect bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(DriWindowDelegateProxy);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_DRI_WINDOW_DELEGATE_PROXY_H_