GLContext no longer holds a pointer to a GLSurface.

ui/gfx/gl/gl_surface_osmesa.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 "ui/gfx/gl/gl_surface_osmesa.h"
 #include "base/logging.h"
 #include "ui/gfx/gl/gl_bindings.h"
 
 namespace gfx {
 
-GLSurfaceOSMesa::GLSurfaceOSMesa(const gfx::Size& size) : size_(size) {
+GLSurfaceOSMesa::GLSurfaceOSMesa(unsigned format, const gfx::Size& size)
+    : format_(format),
+      size_(size) {
 }
 
 GLSurfaceOSMesa::~GLSurfaceOSMesa() {
   Destroy();
 }
 
 void GLSurfaceOSMesa::Resize(const gfx::Size& new_size) {
   if (new_size == size_)
     return;
 
@@ skipping 34 matching lines @@
 }
 
 gfx::Size GLSurfaceOSMesa::GetSize() {
   return size_;
 }
 
 void* GLSurfaceOSMesa::GetHandle() {
   return buffer_.get();
 }
 
+unsigned GLSurfaceOSMesa::GetFormat() {
+  return format_;
+}
+
 void GLSurfaceOSMesa::AllocateBuffer(const Size& size) {
   buffer_.reset(new int32[size.GetArea()]);
   memset(buffer_.get(), 0, size.GetArea() * sizeof(buffer_[0]));
 }
 
 }  // namespace gfx