Fix Sunspider performance regression

content/public/common/renderer_preferences.h

 // 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.
 //
 // A struct for managing browser's settings that apply to the renderer or its
 // webview.  These differ from WebPreferences since they apply to Chromium's
 // glue layer rather than applying to just WebKit.
 //
 // Adding new values to this class probably involves updating
 // common/view_messages.h, browser/browser.cc, etc.
@@ skipping 89 matching lines @@
 
   // Default page zoom level.
   double default_zoom_level;
 
   // The user agent given to WebKit when it requests one and the user agent is
   // being overridden for the current navigation.
   std::string user_agent_override;
 
   // Specifies whether renderer input event throttle is enabled.
   bool throttle_input_events;
+
+  // Specifies whether the renderer reports frame name changes to the browser
+  // process.
+  // TODO(fsamuel): This is a short-term workaround to avoid regressing
+  // Sunspider. We need to find an efficient way to report changes to frame
+  // names to the browser process. See http://crbug.com/169110 for more
+  // information.
+  bool report_frame_name_changes;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_RENDERER_PREFERENCES_H_