Add an API for hosted apps to check their install and running states.

chrome/browser/extensions/extension_tab_helper.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_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_
 #pragma once
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/app_notify_channel_setup.h"
@@ skipping 98 matching lines @@
   void OnDidGetApplicationInfo(int32 page_id, const WebApplicationInfo& info);
   void OnInstallApplication(const WebApplicationInfo& info);
   void OnInlineWebstoreInstall(int install_id,
                                int return_route_id,
                                const std::string& webstore_item_id,
                                const GURL& requestor_url);
   void OnGetAppNotifyChannel(const GURL& requestor_url,
                              const std::string& client_id,
                              int return_route_id,
                              int callback_id);
+  void OnGetAppInstallState(const GURL& requestor_url,
+                            int return_route_id,
+                            int callback_id);
   void OnRequest(const ExtensionHostMsg_Request_Params& params);
 
   // App extensions related methods:
 
   // Resets app_icon_ and if |extension| is non-null creates a new
   // ImageLoadingTracker to load the extension's image.
   void UpdateExtensionAppIcon(const Extension* extension);
 
   const Extension* GetExtension(const std::string& extension_app_id);
 
@@ skipping 36 matching lines @@
 
   // Cached web app info data.
   WebApplicationInfo web_app_info_;
 
   TabContentsWrapper* wrapper_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionTabHelper);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_HELPER_H_