PPAPI: Implement synchronous postMessage

ppapi/tests/test_message_handler.h

+// 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.
+
+#ifndef PPAPI_TESTS_TEST_MESSAGE_HANDLER_H_
+#define PPAPI_TESTS_TEST_MESSAGE_HANDLER_H_
+
+#include <string>
+#include <vector>
+
+#include "ppapi/c/ppb_messaging.h"
+#include "ppapi/tests/test_case.h"
+#include "ppapi/utility/threading/simple_thread.h"
+
+class TestMessageHandler : public TestCase {
+ public:
+  explicit TestMessageHandler(TestingInstance* instance);
+  virtual ~TestMessageHandler();
+
+ private:
+  // TestCase implementation.
+  virtual bool Init();
+  virtual void RunTests(const std::string& filter);
+  virtual void HandleMessage(const pp::Var& message_data);
+
+  std::string TestRegisterErrorConditions();
+  std::string TestPostMessageAndAwaitResponse();
+
+  const PPB_Messaging_1_1* ppb_messaging_if_;
+  pp::SimpleThread handler_thread_;
+};
+
+#endif  // PPAPI_TESTS_TEST_MESSAGE_HANDLER_H_
+