Add a Javascript wrapper around ServiceRegistry and expose it to WebUI.

content/public/renderer/service_registry_js.h

Index: content/public/renderer/service_registry_js.h
diff --git a/content/public/renderer/service_registry_js.h b/content/public/renderer/service_registry_js.h
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+// Copyright 2014 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.
+
+#ifndef CONTENT_PUBLIC_RENDERER_SERVICE_REGISTRY_JS_H_
+#define CONTENT_PUBLIC_RENDERER_SERVICE_REGISTRY_JS_H_
+
+#include "content/common/content_export.h"
+#include "v8/include/v8.h"
+
+namespace content {
+
+class ServiceRegistry;
+
+CONTENT_EXPORT extern const char kServiceRegistryModuleName[];
+
+// Returns a JS wrapper around ServiceRegistry that allows connecting to remote
+// services.
+CONTENT_EXPORT v8::Handle<v8::Value> WrapServiceRegistry(
+    v8::Isolate* isolate, ServiceRegistry* service_registry);
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_RENDERER_SERVICE_REGISTRY_JS_H_