Enable extension APIs for content scripts.

chrome/renderer/extensions/renderer_extension_bindings.h

-// Copyright (c) 2011 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 CHROME_RENDERER_EXTENSIONS_RENDERER_EXTENSION_BINDINGS_H_
-#define CHROME_RENDERER_EXTENSIONS_RENDERER_EXTENSION_BINDINGS_H_
-#pragma once
-
-#include <string>
-
-#include "chrome/renderer/extensions/chrome_v8_context_set.h"
-
-class ExtensionDispatcher;
-
-namespace content {
-class RenderView;
-}
-
-namespace v8 {
-class Extension;
-}
-
-// This class adds extension-related javascript bindings to a renderer.  It is
-// used by both web renderers and extension processes.
-class RendererExtensionBindings {
- public:
-  // Creates an instance of the extension.
-  static v8::Extension* Get(ExtensionDispatcher* dispatcher);
-
-  // Delivers a message sent using content script messaging to some of the
-  // contexts in |bindings_context_set|. If |restrict_to_render_view| is
-  // specified, only contexts in that render view will receive the message.
-  static void DeliverMessage(
-      const ChromeV8ContextSet::ContextSet& context_set,
-      int target_port_id,
-      const std::string& message,
-      content::RenderView* restrict_to_render_view);
-};
-
-#endif  // CHROME_RENDERER_EXTENSIONS_RENDERER_EXTENSION_BINDINGS_H_