Fix MSAA on windows

gpu/command_buffer/service/feature_info.cc

 // Copyright (c) 2012 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/feature_info.h"
 
 #include <set>
 
 #include "base/command_line.h"
 #include "base/macros.h"
@@ skipping 453 matching lines @@
   bool enable_immutable_texture_format_bgra_on_es3 =
       extensions.Contains("GL_APPLE_texture_format_BGRA8888");
 
   // Check if we should allow GL_EXT_texture_format_BGRA8888
   if (extensions.Contains("GL_EXT_texture_format_BGRA8888") ||
       enable_immutable_texture_format_bgra_on_es3 ||
       extensions.Contains("GL_EXT_bgra")) {
     enable_texture_format_bgra8888 = true;
   }
 
-  if (extensions.Contains("GL_EXT_bgra")) {
+  // Only desktop GL and ANGLE guarantee that we can allocate a renderbuffer

[vmiura, 2015/02/25 00:44:13]

nit: Could you clarify the comment to say "Only desktop GL extension GL_EXT_bgra
or ANGLE guarantee..."

+  // with this format.
+  if (extensions.Contains("GL_EXT_bgra") || gl_version_info_->is_angle) {
     enable_render_buffer_bgra = true;
   }
 
   if (extensions.Contains("GL_EXT_read_format_bgra") ||
       extensions.Contains("GL_EXT_bgra")) {
     enable_read_format_bgra = true;
   }
 
   if (enable_texture_format_bgra8888) {
     feature_flags_.ext_texture_format_bgra8888 = true;
@@ skipping 559 matching lines @@
   if (pos == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 FeatureInfo::~FeatureInfo() {
 }
 
 }  // namespace gles2
 }  // namespace gpu