On Linux, automatically create app shortcuts on install or update.

chrome/browser/web_applications/web_app_linux.cc

 // 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.
 
 #include "chrome/browser/web_applications/web_app.h"
 
 #include "base/environment.h"
 #include "base/logging.h"
 #include "chrome/browser/shell_integration_linux.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 22 matching lines @@
 void DeletePlatformShortcuts(
     const base::FilePath& web_app_path,
     const ShellIntegration::ShortcutInfo& shortcut_info) {
   ShellIntegrationLinux::DeleteDesktopShortcuts(shortcut_info.profile_path,
       shortcut_info.extension_id);
 }
 
 void UpdatePlatformShortcuts(
     const base::FilePath& web_app_path,
     const ShellIntegration::ShortcutInfo& shortcut_info) {
-  // TODO(benwells): Implement this.
+  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
+
+  scoped_ptr<base::Environment> env(base::Environment::Create());
+
+  // Find out whether shortcuts are already installed.
+  ShellIntegration::ShortcutLocations creation_locations =
+      ShellIntegrationLinux::DesktopShortcutLocations(
+          env.get(), shortcut_info.profile_path, shortcut_info.extension_id);
+
+  // If there is are existing shortcuts, this will update them and the icon.
+  // If not, this will create an app shortcut with NoDisplay=true, which allows
+  // the operating system to identify the app, but not show it in the menu.
+  // Note that a shortcut with NoDisplay=true does not cause app_shortcut_info
+  // to be true, so the update will preserve the value of NoDisplay.
+  CreatePlatformShortcuts(web_app_path, shortcut_info, creation_locations);
 }
 
 }  // namespace internals
 
 }  // namespace web_app