Reland of Moves mojo_js_integration_tests into blink.

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

 /*
  * 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 71 matching lines @@
 }
 
 void YieldCurrentThread() {
   base::PlatformThread::YieldCurrentThread();
 }
 
 String BlinkRootDir() {
   return FilePathToWebString(BlinkRootFilePath());
 }
 
+String ExecutableDir() {
+  base::FilePath path;
+  base::PathService::Get(base::DIR_EXE, &path);
+  return FilePathToWebString(base::MakeAbsoluteFilePath(path));
+}
+
 String WebTestDataPath(const String& relative_path) {
   return FilePathToWebString(
       BlinkRootFilePath()
           .Append(FILE_PATH_LITERAL("Source/web/tests/data"))
           .Append(WebStringToFilePath(relative_path)));
 }
 
 String PlatformTestDataPath(const String& relative_path) {
   return FilePathToWebString(
       BlinkRootFilePath()
           .Append(FILE_PATH_LITERAL("Source/platform/testing/data"))
           .Append(WebStringToFilePath(relative_path)));
 }
 
 PassRefPtr<SharedBuffer> ReadFromFile(const String& path) {
   base::FilePath file_path = blink::WebStringToFilePath(path);
   std::string buffer;
   base::ReadFileToString(file_path, &buffer);
   return SharedBuffer::Create(buffer.data(), buffer.size());
 }
 
 }  // namespace testing
 }  // namespace blink