Add chrome.webstore API methods to allow sites to see progress of installation

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_
 
 #include "base/compiler_specific.h"
 #include "chrome/renderer/extensions/chrome_v8_extension.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
@@ skipping 12 matching lines @@
 
   // IPC::Listener
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
   void Install(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   void OnInlineWebstoreInstallResponse(
       int install_id, bool success, const std::string& error);
 
+  void OnInlineInstallStageChanged(const std::string& stage);
+
+  void OnInlineInstallDownloadProgress(int percent_downloaded);
+
   // 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(
       blink::WebFrame* frame, const std::string& preferred_store_link_url,
       std::string* webstore_item_id, std::string* error);
 
   DISALLOW_COPY_AND_ASSIGN(WebstoreBindings);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_RENDERER_EXTENSIONS_WEBSTORE_BINDINGS_H_