Send a message through the ozone channel to recreate buffers

ui/ozone/platform/drm/host/drm_window_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 UI_OZONE_PLATFORM_DRM_HOST_DRM_WINDOW_HOST_H_
 #define UI_OZONE_PLATFORM_DRM_HOST_DRM_WINDOW_HOST_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/display/types/display_snapshot.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ozone/platform/drm/host/channel_observer.h"
+#include "ui/ozone/public/gpu_platform_support_host.h"
 #include "ui/platform_window/platform_window.h"
 
 namespace ui {
 
 class DisplayManager;
 class DrmCursor;
 class DrmGpuPlatformSupportHost;
 class DrmGpuWindow;
 class DrmWindowHostManager;
 class EventFactoryEvdev;
 
 // Implementation of the platform window. This object and its handle |widget_|
 // uniquely identify a window. Since the DRI/GBM platform is split into 2
 // pieces (Browser process and GPU process), internally we need to make sure the
 // state is synchronized between the 2 processes.
 //
 // |widget_| is used in both processes to uniquely identify the window. This
 // means that any state on the browser side needs to be propagated to the GPU.
 // State propagation needs to happen before the state change is acknowledged to
 // |delegate_| as |delegate_| is responsible for initializing the surface
 // associated with the window (the surface is created on the GPU process).
 class DrmWindowHost : public PlatformWindow,
                       public PlatformEventDispatcher,
-                      public ChannelObserver {
+                      public ChannelObserver,
+                      public GpuPlatformSupportHost {
  public:
   DrmWindowHost(PlatformWindowDelegate* delegate,
                 const gfx::Rect& bounds,
                 DrmGpuPlatformSupportHost* sender,
                 EventFactoryEvdev* event_factory,
                 DrmCursor* cursor,
                 DrmWindowHostManager* window_manager,
                 DisplayManager* display_manager);
   ~DrmWindowHost() override;
 
@@ skipping 20 matching lines @@
   void ConfineCursorToBounds(const gfx::Rect& bounds) override;
 
   // PlatformEventDispatcher:
   bool CanDispatchEvent(const PlatformEvent& event) override;
   uint32_t DispatchEvent(const PlatformEvent& event) override;
 
   // ChannelObserver:
   void OnChannelEstablished() override;
   void OnChannelDestroyed() override;
 
+  // GpuPlatformSupportHost:
+  void OnChannelEstablished(
+      int host_id,
+      scoped_refptr<base::SingleThreadTaskRunner> send_runner,
+      const base::Callback<void(IPC::Message*)>& send_callback) override;
+  void OnChannelDestroyed(int host_id) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
+
+  void OnWindowMappingChanged(gfx::AcceleratedWidget widget);
+
  private:
   void SendBoundsChange();
 
   PlatformWindowDelegate* delegate_;      // Not owned.
   DrmGpuPlatformSupportHost* sender_;     // Not owned.
   EventFactoryEvdev* event_factory_;      // Not owned.
   DrmCursor* cursor_;                     // Not owned.
   DrmWindowHostManager* window_manager_;  // Not owned.
   DisplayManager* display_manager_;       // Not owned.
 
   gfx::Rect bounds_;
   gfx::AcceleratedWidget widget_;
 
   gfx::Rect cursor_confined_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmWindowHost);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_HOST_DRM_WINDOW_HOST_H_