Chromium implementation of discardBackbuffer WebGraphicsContext3D extension.

ui/gfx/compositor/test_web_graphics_context_3d.h

 // Copyright (c) 2012 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_GFX_COMPOSITOR_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 #define UI_GFX_COMPOSITOR_TEST_WEB_GRAPHICS_CONTEXT_3D_H_
 #pragma once
 
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
@@ skipping 39 matching lines @@
                                          WebKit::WGC3Dint level,
                                          WebKit::WGC3Dint xoffset,
                                          WebKit::WGC3Dint yoffset,
                                          WebKit::WGC3Dsizei width,
                                          WebKit::WGC3Dsizei height,
                                          WebKit::WGC3Denum format,
                                          WebKit::WGC3Denum type,
                                          WebKit::WGC3Denum access);
   virtual void unmapTexSubImage2DCHROMIUM(const void* data) {}
   virtual void setVisibilityCHROMIUM(bool visible) {}
+  virtual void discardFramebufferEXT() {}
+  virtual void ensureFramebufferCHROMIUM() {}
   virtual void setMemoryAllocationChangedCallbackCHROMIUM(
       WebGraphicsMemoryAllocationChangedCallbackCHROMIUM*) { }
   virtual WebKit::WebString getRequestableExtensionsCHROMIUM();
   virtual void requestExtensionCHROMIUM(const char*) {}
   virtual void blitFramebufferCHROMIUM(WebKit::WGC3Dint src_x0,
                                        WebKit::WGC3Dint src_y0,
                                        WebKit::WGC3Dint src_x1,
                                        WebKit::WGC3Dint src_y1,
                                        WebKit::WGC3Dint dst_x0,
                                        WebKit::WGC3Dint dst_y0,
@@ skipping 359 matching lines @@
  private:
   scoped_refptr<gfx::GLContext> gl_context_;
   scoped_refptr<gfx::GLSurface> gl_surface_;
 
   DISALLOW_COPY_AND_ASSIGN(TestWebGraphicsContext3D);
 };
 
 }  // namespace ui
 
 #endif  // UI_GFX_COMPOSITOR_TEST_WEB_GRAPHICS_CONTEXT_3D_H_