[DevTools] Add power profiler and power overview in timeline panel.

Source/devtools/front_end/Target.js

 /*
  * Copyright 2014 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.
  */
 
 /**
  * @constructor
  * @extends {Protocol.Agents}
  * @param {!InspectorBackendClass.Connection} connection
  * @param {function(!WebInspector.Target)=} callback
  */
 WebInspector.Target = function(connection, callback)
 {
     Protocol.Agents.call(this, connection.agentsMap());
     this._connection = connection;
     this.canInspectWorkers = false;
 
     this.pageAgent().canScreencast(this._initializeCapability.bind(this, "canScreencast", null));
+    this.powerAgent().canProfilePower(this._initializeCapability.bind(this, "canProfilePower", null));
     this.workerAgent().canInspectWorkers(this._initializeCapability.bind(this, "canInspectWorkers", this._loadedWithCapabilities.bind(this, callback)));
 
     // In case of loading as a web page with no bindings / harness, kick off initialization manually.
     if (InspectorFrontendHost.isStub) {
         // give a chance to add listeners of WebInspector.Target.Events.TargetIsReady
         setTimeout(this._loadedWithCapabilities.bind(this, callback), 0);
     }
 }
 
 WebInspector.Target.prototype = {
@@ skipping 22 matching lines @@
         WebInspector.debuggerModel = this.debuggerModel;
         this.runtimeModel = new WebInspector.RuntimeModel(this.resourceTreeModel);
         WebInspector.runtimeModel = this.runtimeModel;
 
         //we can't name it domAgent, because it clashes with function, WebInspector.DOMAgent should be renamed to DOMModel
         this._domAgent = new WebInspector.DOMAgent();
         WebInspector.domAgent = this._domAgent;
         this.workerManager = new WebInspector.WorkerManager(this.canInspectWorkers);
         WebInspector.workerManager = this.workerManager;
 
+        if (WebInspector.experimentsSettings.powerTimeline.isEnabled() && this.canProfilePower)
+            WebInspector.powerProfiler = new WebInspector.PowerProfiler();
+
         if (callback)
             callback(this);
     },
 
     __proto__: Protocol.Agents.prototype
 }
 
 /**
  * @constructor
  */
 WebInspector.TargetManager = function()
 {
     /** @type {!Array.<!WebInspector.Target>} */
     this._targets = [];
 }
 
 WebInspector.TargetManager.prototype = {
 
     /**
      * @param {!InspectorBackendClass.Connection} connection
      * @param {function(!WebInspector.Target)=} callback
      */
     createTarget: function(connection, callback)
     {
         var newTarget = new WebInspector.Target(connection, callback);
         this._targets.push(newTarget);
     }
 
 }