Porting ppapi_tests framework to postMessage.

ppapi/tests/test_post_message.cc

 // Copyright (c) 2011 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.
 
 #include "ppapi/tests/test_post_message.h"
 
 #include <algorithm>
 
 #include "ppapi/c/dev/ppb_testing_dev.h"
 #include "ppapi/c/pp_var.h"
@@ skipping 26 matching lines @@
   RUN_TEST(ExtraParam);
 }
 
 void TestPostMessage::HandleMessage(const pp::Var& message_data) {
   message_data_.push_back(message_data);
   testing_interface_->QuitMessageLoop(instance_->pp_instance());
 }
 
 bool TestPostMessage::AddEchoingListener(const std::string& expression) {
   std::string js_code;
+  // Note the following code is dependent on some features of test_case.html.
+  // E.g., it is assumed that the DOM element where the plugin is embedded has
+  // an id of 'plugin', and there is a function 'IsTestingMessage' that allows
+  // us to ignore the messages that are intended for use by the testing
+  // framework itself.
   js_code += "var plugin = document.getElementById('plugin');"
              "var message_handler = function(message_event) {"
-             "  plugin.postMessage(";
+             "  if (!IsTestingMessage(message_event.data)) {"
+             "    plugin.postMessage(";
   js_code += expression;
-  js_code += "  );"
+  js_code += "                      );"
+             "  }"
              "};"
              "plugin.addEventListener('message', message_handler);"
              // Maintain an array of all event listeners, attached to the
              // plugin. This is so that we can easily remove them later (see
              // ClearListeners()).
              "if (!plugin.eventListeners) plugin.eventListeners = [];"
              "plugin.eventListeners.push(message_handler);";
   pp::Var exception;
   instance_->ExecuteScript(js_code, &exception);
   return exception.is_undefined();
@@ skipping 173 matching lines @@
   // Therefore, we will do CallOnMainThread to yield control.  That event should
   // fire, but we should see no messages when we return.
   TestCompletionCallback callback(instance_->pp_instance());
   pp::Module::Get()->core()->CallOnMainThread(0, callback);
   callback.WaitForResult();
   ASSERT_TRUE(message_data_.empty());
 
   PASS();
 }