Plumb through EGL_NV_post_sub_buffer and GLX_MESA_copy_sub_buffer.

webkit/gpu/webgraphicscontext3d_in_process_impl.h

 // Copyright (c) 2011 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 WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_
 #define WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_
 
 #include <list>
 #include <set>
 
@@ skipping 64 matching lines @@
   virtual bool setParentContext(WebGraphicsContext3D* parent_context);
 
   virtual void reshape(int width, int height);
 
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t bufferSize);
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t buffer_size,
                                    WebGLId framebuffer, int width, int height);
 
   virtual WebGLId getPlatformTextureId();
   virtual void prepareTexture();
+  virtual void postSubBufferCHROMIUM(int x, int y, int width, int height);
 
   virtual void synthesizeGLError(WGC3Denum error);
   virtual void* mapBufferSubDataCHROMIUM(WGC3Denum target, WGC3Dintptr offset,
                                          WGC3Dsizeiptr size, WGC3Denum access);
   virtual void unmapBufferSubDataCHROMIUM(const void*);
   virtual void* mapTexSubImage2DCHROMIUM(
       WGC3Denum target,
       WGC3Dint level,
       WGC3Dint xoffset,
       WGC3Dint yoffset,
@@ skipping 400 matching lines @@
   ShHandle fragment_compiler_;
   ShHandle vertex_compiler_;
   gfx::PluginWindowHandle window_;
   scoped_refptr<gfx::GLShareGroup> share_group_;
 };
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // WEBKIT_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_IMPL_H_