diff --git a/webkit/extensions/v8/benchmarking_extension.cc b/webkit/extensions/v8/benchmarking_extension.cc
new file mode 100644
index 0000000..e2e926d2
--- /dev/null
+++ b/webkit/extensions/v8/benchmarking_extension.cc
@@ -0,0 +1,63 @@
+// Copyright (c) 2006-2008 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 "config.h"
+#include "Cache.h"
+#include "webkit/extensions/v8/benchmarking_extension.h"
+#include "webkit/glue/webkit_glue.h"
+
+namespace extensions_v8 {
+
+const char* kBenchmarkingExtensionName = "v8/Benchmarking";
+
+class BenchmarkingWrapper : public v8::Extension {
+ public:
+  BenchmarkingWrapper() :
+      v8::Extension(kBenchmarkingExtensionName,
+        "if (typeof(chromium) == 'undefined') {"
+        "  chromium = {};"
+        "};"
+        "if (typeof(chromium.benchmarking) == 'undefined') {"
+        "  chromium.benchmarking = {};"
+        "};"
+        "chromium.benchmarking.clearCache = function() {"
+        "  native function ClearCache();"
+        "  ClearCache();"
+        "};"
+        "chromium.benchmarking.closeConnections = function() {"
+        "  native function CloseConnections();"
+        "  CloseConnections();"
+        "};") {}
+
+  virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
+      v8::Handle<v8::String> name) {
+    if (name->Equals(v8::String::New("CloseConnections"))) {
+      return v8::FunctionTemplate::New(CloseConnections);
+    } else if (name->Equals(v8::String::New("ClearCache"))) {
+      return v8::FunctionTemplate::New(ClearCache);
+    }
+    return v8::Handle<v8::FunctionTemplate>();
+  }
+
+  static v8::Handle<v8::Value> CloseConnections(const v8::Arguments& args) {
+    webkit_glue::CloseIdleConnections();
+    return v8::Undefined();
+  }
+
+  static v8::Handle<v8::Value> ClearCache(const v8::Arguments& args) {
+    // TODO(mbelshe): should be enable/disable?
+    webkit_glue::SetCacheMode(false);
+
+    // Disabling and re-enabling the cache forces it to flush.
+    WebCore::cache()->setDisabled(true);
+    WebCore::cache()->setDisabled(false);
+    return v8::Undefined();
+  }
+};
+
+v8::Extension* BenchmarkingExtension::Get() {
+  return new BenchmarkingWrapper();
+}
+
+}  // namespace extensions_v8