Add a new ozone switch to enable surfaceless output mode.

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;
@@ skipping 11 matching lines @@
 
   // 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_ptr<SurfaceOzoneEGL> CreateSurfacelessEGLSurfaceForWidget(
+      gfx::AcceleratedWidget widget) OVERRIDE;
   virtual scoped_refptr<ui::NativePixmap> CreateNativePixmap(
       gfx::Size size,
       BufferFormat format) OVERRIDE;
   virtual bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                     int plane_z_order,
                                     gfx::OverlayTransform plane_transform,
                                     scoped_refptr<NativePixmap> buffer,
                                     const gfx::Rect& display_bounds,
                                     const gfx::RectF& crop_rect) 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_