Cast channel: Add cast.channel.getLogs extension API.

chrome/test/data/extensions/api_test/cast_channel/api/test_get_logs.js

Index: chrome/test/data/extensions/api_test/cast_channel/api/test_get_logs.js
diff --git a/chrome/test/data/extensions/api_test/cast_channel/api/test_open_send_close.js b/chrome/test/data/extensions/api_test/cast_channel/api/test_get_logs.js
similarity index 78%
copy from chrome/test/data/extensions/api_test/cast_channel/api/test_open_send_close.js
copy to chrome/test/data/extensions/api_test/cast_channel/api/test_get_logs.js
index 4afce5656836251c04db68826da8fb4297aa6bcc..99acf9faa0fe3fc9b862cb4a15f0602b93816e03 100644
--- a/chrome/test/data/extensions/api_test/cast_channel/api/test_open_send_close.js
+++ b/chrome/test/data/extensions/api_test/cast_channel/api/test_get_logs.js
@@ -1,4 +1,4 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -9,9 +9,14 @@ var message = {
   'data': 'some-string'
 };
 
+var onGetLogs = function(blob) {
+  chrome.test.assertTrue(blob.byteLength > 0);
+  chrome.test.succeed();
+}
+
 var onClose = function(channel) {
   assertClosedChannel(channel);
-  chrome.test.succeed();
+  chrome.cast.channel.getLogs(onGetLogs);
 };
 
 var onSend = function(channel) {