Implement a module system for the extension bindings JS.

chrome/renderer/extensions/webstore_bindings.h

 // 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.
 
 #ifndef CHROME_RENDERER_EXTENSIONS_WEBSTORE_BINDINGS_H_
 #define CHROME_RENDERER_EXTENSIONS_WEBSTORE_BINDINGS_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 
 class ChromeV8Context;
 
 // A V8 extension that creates an object at window.chrome.webstore. This object
 // allows JavaScript to initiate inline installs of apps that are listed in the
 // Chrome Web Store (CWS).
-class WebstoreBindings : public ChromeV8Extension {
+class WebstoreBindings : public ChromeV8Extension,
+                         public ChromeV8ExtensionHandler {
  public:
-  explicit WebstoreBindings(ExtensionDispatcher* dispatcher);
+  explicit WebstoreBindings(ExtensionDispatcher* dispatcher,
+                            ChromeV8Context* context);
 
- protected:
-  virtual ChromeV8ExtensionHandler* CreateHandler(
-      ChromeV8Context* context) OVERRIDE;
+  // IPC::Channel::Listener
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
+  v8::Handle<v8::Value> Install(const v8::Arguments& args);
+
+  void OnInlineWebstoreInstallResponse(
+      int install_id, bool success, const std::string& error);
+
+  // Extracts a Web Store item ID from a <link rel="chrome-webstore-item"
+  // href="https://chrome.google.com/webstore/detail/id"> node found in the
+  // frame. On success, true will be returned and the |webstore_item_id|
+  // parameter will be populated with the ID. On failure, false will be returned
+  // and |error| will be populated with the error.
+  static bool GetWebstoreItemIdFromFrame(
+      WebKit::WebFrame* frame, const std::string& preferred_store_link_url,
+      std::string* webstore_item_id, std::string* error);
+
   DISALLOW_COPY_AND_ASSIGN(WebstoreBindings);
 };
 
 #endif  // CHROME_RENDERER_EXTENSIONS_WEBSTORE_BINDINGS_H_