Take the ANGLE path for glRenderbufferStorageMultisample when on ANGLE.

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 3604 matching lines @@
       case GL_RGB5_A1:
         impl_format = GL_RGBA;
         break;
       case GL_RGB565:
         impl_format = GL_RGB;
         break;
     }
   }
 
   CopyRealGLErrorsToWrapper();
-  glRenderbufferStorageMultisampleEXT(
-      target, samples, impl_format, width, height);
+  if (IsAngle()) {
+    glRenderbufferStorageMultisampleANGLE(
+        target, samples, impl_format, width, height);
+  } else {
+    glRenderbufferStorageMultisampleEXT(
+        target, samples, impl_format, width, height);
+  }

[twiz, 2011/03/22 21:58:17]

Are there other instances where similiar changes will be required?

   GLenum error = glGetError();
   if (error == GL_NO_ERROR) {
     bound_renderbuffer_->SetInfo(samples, internalformat, width, height);
   }
 }
 
 void GLES2DecoderImpl::DoRenderbufferStorage(
   GLenum target, GLenum internalformat, GLsizei width, GLsizei height) {
   if (!bound_renderbuffer_) {
     SetGLError(GL_INVALID_OPERATION,
@@ skipping 2611 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