Plumb through EGL_NV_post_sub_buffer and GLX_MESA_copy_sub_buffer.

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.cc

 // 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.
 
 #if defined(ENABLE_GPU)
 
 #include "webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 740 matching lines @@
   DCHECK(context_);
   return context_->GetParentTextureId();
 }
 
 void WebGraphicsContext3DInProcessCommandBufferImpl::prepareTexture() {
   // Copies the contents of the off-screen render target into the texture
   // used by the compositor.
   context_->SwapBuffers();
 }
 
+void WebGraphicsContext3DInProcessCommandBufferImpl::postSubBufferCHROMIUM(
+    int x, int y, int width, int height) {
+  gl_->PostSubBufferCHROMIUM(x, y, width, height);
+}
+
 void WebGraphicsContext3DInProcessCommandBufferImpl::reshape(
     int width, int height) {
   cached_width_ = width;
   cached_height_ = height;
 
   // TODO(gmam): See if we can comment this in.
   // ClearContext();
 
   gl_->ResizeCHROMIUM(width, height);
 
@@ skipping 895 matching lines @@
   context_lost_reason_ = GL_UNKNOWN_CONTEXT_RESET_ARB;
   if (context_lost_callback_) {
     context_lost_callback_->onContextLost();
   }
 }
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // defined(ENABLE_GPU)