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

content/renderer/service_registry_js_wrapper.h

Index: content/renderer/service_registry_js_wrapper.h
diff --git a/content/renderer/service_registry_js_wrapper.h b/content/renderer/service_registry_js_wrapper.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_RENDERER_SERVICE_REGISTRY_JS_WRAPPER_H_
+#define CONTENT_RENDERER_SERVICE_REGISTRY_JS_WRAPPER_H_
+
+#include <string>
+
+#include "content/common/content_export.h"
+#include "content/public/renderer/service_registry_js.h"
+#include "gin/handle.h"
+#include "gin/object_template_builder.h"
+#include "gin/wrappable.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace content {
+
+class ServiceRegistry;
+
+// A JS wrapper around ServiceRegistry that allows connecting to remote
+// services.
+class CONTENT_EXPORT ServiceRegistryJsWrapper
+    : public gin::Wrappable<ServiceRegistryJsWrapper> {
+ public:
+  virtual ~ServiceRegistryJsWrapper();
+  static gin::Handle<ServiceRegistryJsWrapper> Create(
+      v8::Isolate* isolate,
+      base::WeakPtr<ServiceRegistry> service_registry);
+
+  // gin::Wrappable<ServiceRegistryJsWrapper> overrides.
+  virtual gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) OVERRIDE;
+
+  // JS interface implementation.
+  mojo::Handle GetInterface(const std::string& service_name);
+
+  static gin::WrapperInfo kWrapperInfo;
+
+ private:
+  explicit ServiceRegistryJsWrapper(
+      base::WeakPtr<ServiceRegistry> service_registry);
+
+  base::WeakPtr<ServiceRegistry> service_registry_;
+
+  DISALLOW_COPY_AND_ASSIGN(ServiceRegistryJsWrapper);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_SERVICE_REGISTRY_JS_WRAPPER_H_