DevTools: Show GPU utilization bar on timeline

Source/devtools/front_end/TimelineManager.js

Index: Source/devtools/front_end/TimelineManager.js
diff --git a/Source/devtools/front_end/TimelineManager.js b/Source/devtools/front_end/TimelineManager.js
index 80c3f12f49efdeed2df038ea9d1d0e97bd60788d..6e5ebfc88c8303eee7f7f988a76c4effecc7dc0e 100644
--- a/Source/devtools/front_end/TimelineManager.js
+++ b/Source/devtools/front_end/TimelineManager.js
@@ -58,13 +58,14 @@ WebInspector.TimelineManager.prototype = {
     /**
      * @param {number=} maxCallStackDepth
      * @param {boolean=} includeDomCounters
+     * @param {boolean=} includeGpuEvents
      * @param {function(?Protocol.Error)=} callback
      */
-    start: function(maxCallStackDepth, includeDomCounters, callback)
+    start: function(maxCallStackDepth, includeDomCounters, includeGpuEvents, callback)
     {
         this._enablementCount++;
         if (this._enablementCount === 1)
-            TimelineAgent.start(maxCallStackDepth, /* bufferEvents */false, includeDomCounters, callback);
+            TimelineAgent.start(maxCallStackDepth, /* bufferEvents */false, includeDomCounters, includeGpuEvents, callback);
         else if (callback)
             callback(null);
     },