Allow GLSurface to indicate that it supports a specific extension.

gpu/command_buffer/service/gles2_cmd_decoder.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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 5721 matching lines @@
       // Validation should have prevented us from getting here.
       NOTREACHED();
       break;
   }
   return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::HandlePostSubBufferCHROMIUM(
     uint32 immediate_data_size, const gles2::PostSubBufferCHROMIUM& c) {
   TRACE_EVENT0("gpu", "GLES2DecoderImpl::HandlePostSubBufferCHROMIUM");
-  if (!surface_->SupportsPostSubBuffer()) {
+  if (!context_->HasExtension("GL_CHROMIUM_post_sub_buffer")) {
     SetGLError(GL_INVALID_OPERATION,
                "glPostSubBufferCHROMIUM: command not supported by surface");
     return error::kNoError;
   }
   if (surface_->PostSubBuffer(c.x, c.y, c.width, c.height))
     return error::kNoError;
   else
     return error::kLostContext;
 }
 
@@ skipping 1731 matching lines @@
   return error::kNoError;
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu