Add C++ Trace Event support to PPAPI/NaCl SDK

native_client_sdk/src/examples/trace_events/example.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.
+
+// Called by the common.js module.
+function moduleDidLoad() {
+  // The module is not hidden by default so we can easily see if the plugin
+  // failed to load.
+  common.hideModule();
+}
+
+// Called by the common.js module.
+function attachListeners() {
+  document.getElementById('runthreadedtask').addEventListener('click',
+                                                              runthreadedtask);
+  document.getElementById('sendasynctrace').addEventListener('click',
+                                                             sendasynctrace);
+}
+
+function runthreadedtask() {
+  common.naclModule.postMessage('runthreadedtask');
+}
+
+function sendasynctrace() {
+  var async_button = document.getElementById('sendasynctrace');
+  if (async_button.value == 'Send trace begin') {
+    common.naclModule.postMessage('sendasyncbegin');
+    async_button.value = 'Send trace end';
+  } else {
+    common.naclModule.postMessage('sendasyncend');
+    async_button.value = 'Send trace begin';
+  }
+}
+
+// Called by the common.js module.
+function handleMessage(message_event) {
+}