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

ppapi/tests/test_var.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_TEST_TEST_VAR_H_
 #define PPAPI_TEST_TEST_VAR_H_
 
 #include <string>
 
 #include "ppapi/cpp/var.h"
 #include "ppapi/tests/test_case.h"
 
 struct PPB_Var;
 
 class TestVar : public TestCase {
  public:
   explicit TestVar(TestingInstance* instance) : TestCase(instance) {}
 
  private:
   // TestCase implementation.
   virtual bool Init();
-  virtual void RunTest();
+  virtual void RunTests(const std::string& filter);
 
   std::string TestBasicString();
   std::string TestInvalidAndEmpty();
   std::string TestInvalidUtf8();
   std::string TestNullInputInUtf8Conversion();
   std::string TestValidUtf8();
   std::string TestUtf8WithEmbeddedNulls();
   std::string TestVarToUtf8ForWrongType();
   std::string TestHasPropertyAndMethod();
 
   // Used by the tests that access the C API directly.
   const PPB_Var* var_interface_;
 };
 
 #endif  // PPAPI_TEST_TEST_VAR_H_