Add Pepper API tests for chrome.socket.

chrome/test/data/extensions/api_test/socket/ppapi/controller.js

+// Copyright (c) 2013 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.
+
+var control_message;
+
+function testAll() {
+  var nacl_module = document.getElementById('nacl_module');
+  // The plugin will start the corresponding test and post a message back when
+  // the test is done. If the test has failed, the message is a description of
+  // the error; otherwise the message is empty.
+  nacl_module.postMessage(control_message);
+}
+
+var onControlMessageReceived = function(message) {
+  control_message = message;
+  chrome.test.runTests([ testAll ]);

[Nick Bray (chromium), 2013/04/12 16:57:45]

nit: [ testAll ] => [testAll]

[yzshen1, 2013/04/12 19:15:05]

Done.

+}
+
+var onPluginMessageReceived = function(message) {
+  if (message.data == "ready") {
+    chrome.test.sendMessage("info_please", onControlMessageReceived);
+  } else if (message.data) {
+    chrome.test.fail(message.data);
+  } else {
+    chrome.test.succeed();
+  }
+};
+
+window.onload = function() {
+  var nacl_module = document.getElementById('nacl_module');
+  nacl_module.addEventListener("message", onPluginMessageReceived, false);
+};
+