ozone: gbm: Add overlay support

ui/ozone/platform/dri/dri_surface.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_SURFACE_H_
 #define UI_OZONE_PLATFORM_DRI_DRI_SURFACE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/geometry/size.h"
@@ skipping 14 matching lines @@
   DriSurface(DriWrapper* dri, const gfx::Size& size);
   virtual ~DriSurface();
 
   // Get a Skia canvas for a backbuffer.
   SkCanvas* GetDrawableForWidget();
 
   // ScanoutSurface:
   virtual bool Initialize() OVERRIDE;
   virtual uint32_t GetFramebufferId() const OVERRIDE;
   virtual uint32_t GetHandle() const OVERRIDE;
+  virtual void PreSwapBuffers() OVERRIDE;
   virtual void SwapBuffers() OVERRIDE;
   virtual gfx::Size Size() const OVERRIDE;
 
  private:
   DriBuffer* frontbuffer() const { return bitmaps_[front_buffer_].get(); }
   DriBuffer* backbuffer() const { return bitmaps_[front_buffer_ ^ 1].get(); }
 
   // Used to create the backing buffers.
   virtual DriBuffer* CreateBuffer();
 
   // Stores the connection to the graphics card. Pointer not owned by this
   // class.
   DriWrapper* dri_;
 
   // The actual buffers used for painting.
   scoped_ptr<DriBuffer> bitmaps_[2];
 
   // Keeps track of which bitmap is |buffers_| is the frontbuffer.
   int front_buffer_;
 
   // Surface size.
   gfx::Size size_;
 
   DISALLOW_COPY_AND_ASSIGN(DriSurface);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_DRI_SURFACE_H_