V8: Roll googletest to 1.8.0.

testing/gtest/include/gtest/gtest.h

Index: testing/gtest/include/gtest/gtest.h
diff --git a/testing/gtest/include/gtest/gtest.h b/testing/gtest/include/gtest/gtest.h
new file mode 100644
index 0000000000000000000000000000000000000000..b026e3a6dfd2c8ab8d60292ceb2fde49befa50a3
--- /dev/null
+++ b/testing/gtest/include/gtest/gtest.h
@@ -0,0 +1,10 @@
+// Copyright 2017 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.
+
+// The file/directory layout of Google Test is not yet considered stable. Until
+// it stabilizes, Chromium code will use forwarding headers in testing/gtest
+// and testing/gmock, instead of directly including files in
+// third_party/googletest.
+
+#include "third_party/googletest/src/googletest/include/gtest/gtest.h"