Plumb thru that we cache the front buffer.

gpu/command_buffer/service/feature_info.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 <set>
 #include <string>
 #include "gpu/command_buffer/service/feature_info.h"
 #include "gpu/command_buffer/service/gl_utils.h"
 #include "ui/gfx/gl/gl_context.h"
 #include "ui/gfx/gl/gl_implementation.h"
@@ skipping 375 matching lines @@
   //     GL_OES_element_index_uint
 
   feature_flags_.enable_texture_float_linear = enable_texture_float_linear;
   feature_flags_.enable_texture_half_float_linear =
       enable_texture_half_float_linear;
   feature_flags_.npot_ok = npot_ok;
 
   if (ext.HaveAndDesire("GL_CHROMIUM_post_sub_buffer")) {
     AddExtensionString("GL_CHROMIUM_post_sub_buffer");
   }
+
+  if (ext.HaveAndDesire("GL_CHROMIUM_front_buffer_cached")) {
+    AddExtensionString("GL_CHROMIUM_front_buffer_cached");
+  }
 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu