added gpu_benchmarking_extension boilerplate and hooked it up to a new switch.

content/public/common/content_switches.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 "content/public/common/content_switches.h"
 
 namespace switches {
 
 // By default, file:// URIs cannot read other file:// URIs. This is an
 // override for developers who need the old behavior for testing.
@@ skipping 251 matching lines @@
 
 // Enable the JavaScript Full Screen API.
 const char kDisableFullScreen[]             = "disable-fullscreen";
 
 // Enable the JavaScript Pointer Lock API.
 const char kEnablePointerLock[]             = "enable-pointer-lock";
 
 // Enable the Gamepad API
 const char kEnableGamepad[]                 = "enable-gamepad";
 
+// Enables the GPU benchmarking extension
+const char kEnableGpuBenchmarking[]         = "enable-gpu-benchmarking";
+
 // Force logging to be enabled.  Logging is disabled by default in release
 // builds.
 const char kEnableLogging[]                 = "enable-logging";
 
 // Enables Media Source API on <audio>/<video> elements.
 const char kEnableMediaSource[]             = "enable-media-source";
 
 // Enable media stream in WebKit.
 // http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#mediastream
 const char kEnablePeerConnection[]          = "enable-peer-connection";
@@ skipping 376 matching lines @@
 const char kDefaultTileWidth[]              = "default-tile-width";
 const char kDefaultTileHeight[]             = "default-tile-height";
 
 // Sets the width and height above which a composited layer will get tiled.
 const char kMaxUntiledLayerWidth[]          = "max-untiled-layer-width";
 const char kMaxUntiledLayerHeight[]         = "max-untiled-layer-height";
 
 const char kFixedPositionCreatesStackingContext[]
     = "fixed-position-creates-stacking-context";
 }  // namespace switches