Make it possible to enable/disable specific ppapi tests. Migrate PostMessage tests.

ppapi/tests/test_flash_clipboard.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_FLASH_CLIPBOARD_H_
 #define PPAPI_TESTS_TEST_FLASH_CLIPBOARD_H_
 
 #include <string>
 
 #include "ppapi/c/private/ppb_flash_clipboard.h"
 #include "ppapi/tests/test_case.h"
 #include "ppapi/tests/test_utils.h"
 
 class TestFlashClipboard : public TestCase {
  public:
   explicit TestFlashClipboard(TestingInstance* instance);
 
   // TestCase implementation.
   virtual bool Init();
-  virtual void RunTest();
+  virtual void RunTests(const std::string& filter);
 
  private:
   std::string TestReadWrite();
 
   const PPB_Flash_Clipboard* clipboard_interface_;
 };
 
 #endif  // PAPPI_TESTS_TEST_FLASH_FULLSCREEN_H_