Added rendering benchmark javascript hook

content/renderer/rendering_benchmark.cc

Index: content/renderer/rendering_benchmark.cc
diff --git a/content/renderer/rendering_benchmark.cc b/content/renderer/rendering_benchmark.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5415bdd7d8ff57e7117df1017321282eb9a83bd4
--- /dev/null
+++ b/content/renderer/rendering_benchmark.cc
@@ -0,0 +1,12 @@
+// Copyright (c) 2012 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.
+
+#include "content/renderer/rendering_benchmark.h"
+
+namespace content {
+
+RenderingBenchmark::RenderingBenchmark(const std::string& name) : name_(name) {}
+RenderingBenchmark::~RenderingBenchmark() {}
+
+}  // namespace content