Reland of Moves mojo_js_integration_tests into blink.

third_party/WebKit/Source/platform/testing/UnitTestHelpers.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 34 matching lines @@
 
 void EnterRunLoop();
 void ExitRunLoop();
 
 void YieldCurrentThread();
 
 // Returns Blink top directory as an absolute path, e.g.
 // /src/third_party/WebKit.
 String BlinkRootDir();
 
+// Returns directory containing the current executable as absolute path.
+String ExecutableDir();
+
 // Returns test data absolute path for webkit_unit_tests, i.e.
 // <blinkRootDir>/Source/web/tests/data/<relativePath>.
 // It returns the top web test directory if |relativePath| was not specified.
 String WebTestDataPath(const String& relative_path = String());
 
 // Returns test data absolute path for blink_platform_unittests, i.e.
 // <blinkRootDir>/Source/platform/testing/data/<relativePath>.
 // It returns the top platform test directory if |relativePath| was not
 // specified.
 String PlatformTestDataPath(const String& relative_path = String());
 
 PassRefPtr<SharedBuffer> ReadFromFile(const String& path);
 
 }  // namespace testing
 }  // namespace blink
 
 #endif