Allow GLSurface to indicate that it supports a specific extension.

webkit/gpu/webgraphicscontext3d_in_process_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.
 
 #include "webkit/gpu/webgraphicscontext3d_in_process_impl.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 317 matching lines @@
     gl_surface_->SwapBuffers();
   } else if (!render_directly_to_web_view_) {
     // We need to prepare our rendering results for the compositor.
     makeContextCurrent();
     ResolveMultisampledFramebuffer(0, 0, cached_width_, cached_height_);
   }
 }
 
 void WebGraphicsContext3DInProcessImpl::postSubBufferCHROMIUM(
     int x, int y, int width, int height) {
-  DCHECK(gl_surface_->SupportsPostSubBuffer());
+  DCHECK(gl_context_->HasExtension("GL_CHROMIUM_post_sub_buffer"));
   gl_surface_->PostSubBuffer(x, y, width, height);
 }
 
 namespace {
 
 int CreateTextureObject(GLenum target) {
   GLuint texture = 0;
   glGenTextures(1, &texture);
   glBindTexture(target, texture);
   glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
@@ skipping 1341 matching lines @@
   if (length > 1) {
     entry->translated_source.reset(new char[length]);
     ShGetObjectCode(compiler, entry->translated_source.get());
   }
   entry->is_valid = true;
   return true;
 }
 
 }  // namespace gpu
 }  // namespace webkit