Cast: Add GetStats() extensions API.

chrome/test/data/extensions/api_test/cast_streaming/common.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.
 
 function TestStateMachine(stream, audioId, videoId, udpId) {
   this.stream = stream;
   this.audioId = audioId;
   this.videoId = videoId;
   this.udpId = udpId;
   this.audioStarted = false;
   this.videoStarted = false;
   this.audioStopped = false;
   this.videoStopped = false;
   this.gotAudioRawEvents = false;
   this.gotVideoRawEvents = false;
+  this.gotAudioStats = false;
+  this.gotVideoStats = false;
 }
 
 TestStateMachine.prototype.onStarted = function(id) {
   if (id == this.audioId)
     this.audioStarted = true;
   if (id == this.videoId)
     this.videoStarted = true;
   if (this.audioStarted && this.videoStarted)
     this.onAllStarted();
 }
 
 TestStateMachine.prototype.onStopped = function(id) {
   if (id == this.audioId)
     this.audioStopped = true;
   if (id == this.videoId)
     this.videoStopped = true;
   if (this.audioStopped && this.videoStopped)
     this.onAllStopped();
 }
 
-TestStateMachine.prototype.onGotRawEvents = function(id, rawEvents) {
-  chrome.test.assertTrue(rawEvents.length > 0);
+TestStateMachine.prototype.onGotLogs = function(id, isStats, data) {
+  chrome.test.assertTrue(data.length > 0);
   if (id == this.audioId) {
-    this.gotAudioRawEvents = true;
+    if (isStats)
+      this.gotAudioStats = true;
+    else
+      this.gotAudioRawEvents = true;
   }
   if (id == this.videoId) {
-    this.gotVideoRawEvents = true;
+    if (isStats)
+      this.gotVideoStats = true;
+    else
+      this.gotVideoRawEvents = true;
   }
-  if (this.gotAudioRawEvents && this.gotVideoRawEvents)
-    this.onGotAllRawEvents();
+  if (this.gotAudioRawEvents && this.gotVideoRawEvents &&
+      this.gotAudioStats && this.gotVideoStats) {
+    this.onGotAllLogs();
+  }
 }