Added rendering benchmark javascript hook

content/public/renderer/rendering_benchmark.cc

Index: content/public/renderer/rendering_benchmark.cc
diff --git a/content/public/renderer/rendering_benchmark.cc b/content/public/renderer/rendering_benchmark.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b6091180c502268c2f198fc40243894dceeddc00
--- /dev/null
+++ b/content/public/renderer/rendering_benchmark.cc
@@ -0,0 +1,22 @@
+// 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/public/renderer/rendering_benchmark.h"
+
+namespace content {
+
+RenderingBenchmark::RenderingBenchmark(const std::string& name,
+                                       RenderingBenchmarkResults* results)
+    : name_(name),
+      results_(results) {}
+
+RenderingBenchmark::~RenderingBenchmark() {}
+
+void RenderingBenchmark::RecordResult(const std::string& result_name,
+                                      const std::string& time_unit,
+                                      double time) {
+  results_->addResult(name_, result_name, time_unit, time);
+}
+
+}  // namespace content