Set Browser::app_name_ in a reasonable way for extension apps.

chrome/browser/web_applications/web_app.h

 // Copyright (c) 2010 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_WEB_APPLICATIONS_WEB_APP_H_
 #define CHROME_BROWSER_WEB_APPLICATIONS_WEB_APP_H_
 #pragma once
 
 #include <vector>
 
 #include "base/callback.h"
 #include "build/build_config.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/common/web_apps.h"
 
 class FilePath;
 class Profile;
 class TabContents;
 
 namespace web_app {
 
 // Compute a deterministic name based on the URL. We use this pseudo name
 // as a key to store window location per application URLs in Browser and
 // as app id for BrowserWindow, shortcut and jump list.
 std::string GenerateApplicationNameFromURL(const GURL& url);
 
+// Compute a deterministic name based on an extension/apps's id.
+std::string GenerateApplicationNameFromExtensionId(const std::string& id);
+
 // Callback after user dismisses CreateShortcutView. "true" indicates
 // shortcut is created successfully. Otherwise, it is false.
 typedef Callback1<bool>::Type CreateShortcutCallback;
 
 // Creates a shortcut for web application based on given shortcut data.
 // |profile_path| is used as root directory for persisted data such as icon.
 // Directory layout is similar to what Gears has, i.e. an web application's
 // file is stored under "#/host_name/scheme_port", where '#' is the
-// |root_dir|.
+// |root_dir|.  A crx based app uses a directory named _crx_<app id>.
 void CreateShortcut(
     const FilePath& profile_path,
     const ShellIntegration::ShortcutInfo& shortcut_info,
     CreateShortcutCallback* callback);
 
 // Returns true if given url is a valid web app url.
 bool IsValidUrl(const GURL& url);
 
 // Returns data dir for web apps for given profile path.
 FilePath GetDataDir(const FilePath& profile_path);
@@ skipping 13 matching lines @@
 // Updates web app shortcut of the TabContents. This function checks and
 // updates web app icon and shortcuts if needed. For icon, the check is based
 // on MD5 hash of icon image. For shortcuts, it checks the desktop, start menu
 // and quick launch (as well as pinned shortcut) for shortcut and only
 // updates (recreates) them if they exits.
 void UpdateShortcutForTabContents(TabContents* tab_contents);
 
 };  // namespace web_app
 
 #endif  // CHROME_BROWSER_WEB_APPLICATIONS_WEB_APP_H_