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

ppapi/tests/test_directory_reader.h

Index: ppapi/tests/test_directory_reader.h
diff --git a/ppapi/tests/test_directory_reader.h b/ppapi/tests/test_directory_reader.h
index 932d1b36901c784d04e5d9271179c2656b094a2e..8f6853009fe344790db9e21109336b6c0f1bed52 100644
--- a/ppapi/tests/test_directory_reader.h
+++ b/ppapi/tests/test_directory_reader.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -16,7 +16,7 @@ class TestDirectoryReader : public TestCase {
 
   // TestCase implementation.
   virtual bool Init();
-  virtual void RunTest();
+  virtual void RunTests(const std::string& filter);
 
  private:
   std::string TestGetNextFile();