Add support for returning traces as streams in DevTools protocol

Source/devtools/front_end/sdk/TracingManager.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.
  */
 
 /**
  * @interface
  */
 WebInspector.TracingManagerClient = function()
@@ skipping 40 matching lines @@
         ph: string,
         name: string,
         args: !Object,
         dur: number,
         id: number,
         s: string
     }}
  */
 WebInspector.TracingManager.EventPayload;
 
+WebInspector.TracingManager.TransferMode = {
+    ReportEvents: "ReportEvents",
+    ReturnAsStream: "ReturnAsStream"
+};
+
 WebInspector.TracingManager.prototype = {
     /**
      * @return {?WebInspector.Target}
      */
     target: function()
     {
         return this._target;
     },
 
     /**
@@ skipping 34 matching lines @@
      * @param {string} categoryFilter
      * @param {string} options
      * @param {function(?string)=} callback
      */
     start: function(client, categoryFilter, options, callback)
     {
         if (this._activeClient)
             throw new Error("Tracing is already started");
         var bufferUsageReportingIntervalMs = 500;
         this._activeClient = client;
-        this._target.tracingAgent().start(categoryFilter, options, bufferUsageReportingIntervalMs, callback);
+        this._target.tracingAgent().start(categoryFilter, options, bufferUsageReportingIntervalMs, WebInspector.TracingManager.TransferMode.ReportEvents, callback);
         this._activeClient.tracingStarted();
     },
 
     stop: function()
     {
         this._target.tracingAgent().end();
     }
 }
 
 /**
@@ skipping 28 matching lines @@
     },
 
     /**
      * @override
      */
     tracingComplete: function()
     {
         this._tracingManager._tracingComplete();
     }
 }