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

chrome/browser/web_applications/web_app_linux.cc

Index: chrome/browser/web_applications/web_app_linux.cc
diff --git a/chrome/browser/web_applications/web_app_linux.cc b/chrome/browser/web_applications/web_app_linux.cc
index 0378b2acfb480b363b32f19409064ce482960023..27274ea782d111fa01fe5943e980b778e14bd7a9 100644
--- a/chrome/browser/web_applications/web_app_linux.cc
+++ b/chrome/browser/web_applications/web_app_linux.cc
@@ -40,7 +40,21 @@ void DeletePlatformShortcuts(
 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