ozone: gbm: Add overlay support

ui/ozone/platform/dri/gbm_surface_factory.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_GBM_SURFACE_FACTORY_H_
 #define UI_OZONE_PLATFORM_DRI_GBM_SURFACE_FACTORY_H_
 
 #include "ui/ozone/platform/dri/dri_surface_factory.h"
 
 struct gbm_device;
 
 namespace ui {
 
 class GbmSurfaceFactory : public DriSurfaceFactory {
  public:
-  GbmSurfaceFactory();
+  GbmSurfaceFactory(bool allow_surfaceless);
   virtual ~GbmSurfaceFactory();
 
   void InitializeGpu(DriWrapper* dri,
                      gbm_device* device,
                      ScreenManager* screen_manager);
 
   // DriSurfaceFactory:
   virtual intptr_t GetNativeDisplay() OVERRIDE;
   virtual const int32_t* GetEGLSurfaceProperties(
       const int32_t* desired_list) OVERRIDE;
   virtual bool LoadEGLGLES2Bindings(
       AddGLLibraryCallback add_gl_library,
       SetGLGetProcAddressProcCallback set_gl_get_proc_address) OVERRIDE;
   virtual scoped_ptr<ui::SurfaceOzoneEGL> CreateEGLSurfaceForWidget(
       gfx::AcceleratedWidget w) OVERRIDE;
   virtual scoped_refptr<ui::NativePixmap> CreateNativePixmap(
       gfx::Size size,
       BufferFormat format) OVERRIDE;
+  virtual bool CanShowPrimaryPlaneAsOverlay() OVERRIDE;
 
  private:
   gbm_device* device_;  // Not owned.
+  bool allow_surfaceless_;
 
   DISALLOW_COPY_AND_ASSIGN(GbmSurfaceFactory);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_GBM_SURFACE_FACTORY_H_