DevTools: Allow disabling timeline live update as an experiment.

Source/devtools/front_end/TimelineModel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 203 matching lines @@
     },
 
     /**
      * @param {boolean=} includeCounters
      */
     startRecording: function(includeCounters)
     {
         this._clientInitiatedRecording = true;
         this.reset();
         var maxStackFrames = WebInspector.settings.timelineCaptureStacks.get() ? 30 : 0;
+        var bufferEvents = WebInspector.experimentsSettings.timelineNoLiveUpdate.isEnabled() && !WebInspector.settings.timelineLiveUpdate.get();
         var includeGPUEvents = WebInspector.experimentsSettings.gpuTimeline.isEnabled();
-        WebInspector.timelineManager.start(maxStackFrames, includeCounters, includeGPUEvents, this._fireRecordingStarted.bind(this));
+        WebInspector.timelineManager.start(maxStackFrames, bufferEvents, includeCounters, includeGPUEvents, this._fireRecordingStarted.bind(this));
     },
 
     stopRecording: function()
     {
         if (!this._clientInitiatedRecording) {
-            WebInspector.timelineManager.start(undefined, undefined, undefined, stopTimeline.bind(this));
+            WebInspector.timelineManager.start(undefined, undefined, undefined, undefined, stopTimeline.bind(this));
             return;
         }
 
         /**
          * Console started this one and we are just sniffing it. Initiate recording so that we
          * could stop it.
          * @this {WebInspector.TimelineModel}
          */
         function stopTimeline()
         {
@@ skipping 32 matching lines @@
         }
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
     _onStopped: function(event)
     {
         if (event.data) {
             // Stopped from console.
-            this._fireRecordingStopped();
+            this._fireRecordingStopped(null);
         }
     },
 
     _fireRecordingStarted: function()
     {
         this._collectionEnabled = true;
         this.dispatchEventToListeners(WebInspector.TimelineModel.Events.RecordingStarted);
     },
 
-    _fireRecordingStopped: function()
+    /**
+     * @param {?Protocol.Error} error
+     * @param {!Array.<!TimelineAgent.TimelineEvent>=} events
+     */
+    _fireRecordingStopped: function(error, events)
     {
         this._collectionEnabled = false;
+        for (var i = 0; events && i < events.length; ++i)
+            this._addRecord(events[i]);
         this.dispatchEventToListeners(WebInspector.TimelineModel.Events.RecordingStopped);
     },
 
     /**
      * @param {!TimelineAgent.TimelineEvent} payload
      */
     _addRecord: function(payload)
     {
         this._internStrings(payload);
         this._payloads.push(payload);
@@ skipping 853 matching lines @@
 WebInspector.TimelineModel._quadFromRectData = function(data)
 {
     if (typeof data["x"] === "undefined" || typeof data["y"] === "undefined")
         return null;
     var x0 = data["x"];
     var x1 = data["x"] + data["width"];
     var y0 = data["y"];
     var y1 = data["y"] + data["height"];
     return [x0, y0, x1, y0, x1, y1, x0, y1];
 }