Reland http://codereview.chromium.org/7648033

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>
 
@@ skipping 35 matching lines @@
   // 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_