Add test for calling PostMessage during Init. Deflakify TestPostMessage.

ppapi/tests/test_post_message.h

 // 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.
 
 #ifndef PPAPI_TESTS_TEST_POST_MESSAGE_H_
 #define PPAPI_TESTS_TEST_POST_MESSAGE_H_
 
 #include <string>
 #include <vector>
 
 #include "ppapi/tests/test_case.h"
 
 class TestPostMessage : public TestCase {
  public:
-  explicit TestPostMessage(TestingInstance* instance) : TestCase(instance) {}
+  explicit TestPostMessage(TestingInstance* instance);
+  virtual ~TestPostMessage();
 
  private:
   // TestCase implementation.
   virtual bool Init();
   virtual void RunTest();
 
   // A handler for JS->Native calls to postMessage.  Simply pushes
   // the given value to the back of message_data_
   virtual void HandleMessage(const pp::Var& message_data);
 
   // Add a listener for message events which will echo back the given
   // JavaScript expression by passing it to postMessage. JavaScript Variables
   // available to the expression are:
   //  'plugin' - the DOM element for the test plugin.
   //  'message_event' - the message event parameter to the listener function.
   // This also adds the new listener to an array called 'eventListeners' on the
   // plugin's DOM element. This is used by ClearListeners().
   // Returns true on success, false on failure.
   bool AddEchoingListener(const std::string& expression);
 
   // Clear any listeners that have been added using AddEchoingListener by
   // calling removeEventListener for each.
   // Returns true on success, false on failure.
   bool ClearListeners();
 
+  // Wait for pending messages; return the number of messages that were pending
+  // at the time of invocation.
+  int WaitForMessages();
+
+  // Test that we can send a message from Instance::Init. Note the actual
+  // message is sent in TestPostMessage::Init, and this test simply makes sure
+  // we got it.
+  std::string TestSendInInit();
+
   // Test some basic functionality;  make sure we can send data successfully
   // in both directions.
   std::string TestSendingData();
 
   // Test the MessageEvent object that JavaScript received to make sure it is
   // of the right type and has all the expected fields.
   std::string TestMessageEvent();
 
   // Test sending a message when no handler exists, make sure nothing happens.
   std::string TestNoHandler();
 
   // Test sending from JavaScript to the plugin with extra parameters, make sure
   // nothing happens.
   std::string TestExtraParam();
 
   // Test sending messages off of the main thread.
   std::string TestNonMainThread();
 
   typedef std::vector<pp::Var> VarVector;
 
   // This is used to store pp::Var objects we receive via a call to
   // HandleMessage.
   VarVector message_data_;
 };
 
 #endif  // PPAPI_TESTS_TEST_POST_MESSAGE_H_