Start app shim when app launched.

chrome/browser/web_applications/web_app_mac.h

Index: chrome/browser/web_applications/web_app_mac.h
diff --git a/chrome/browser/web_applications/web_app_mac.h b/chrome/browser/web_applications/web_app_mac.h
index 236fe957a6ab3b8adbbb32ba6931e4a5e90dc375..91d46d71642b85e195e1c381f14c345ebdd5d256 100644
--- a/chrome/browser/web_applications/web_app_mac.h
+++ b/chrome/browser/web_applications/web_app_mac.h
@@ -25,6 +25,9 @@ namespace web_app {
 base::FilePath GetAppInstallPath(
     const ShellIntegration::ShortcutInfo& shortcut_info);
 
+// If necessary, launch the shortcut for an app.
+void MaybeLaunchShortcut(const ShellIntegration::ShortcutInfo& shortcut_info);
+
 // Creates a shortcut for a web application. The shortcut is a stub app
 // that simply loads the browser framework and runs the given app.
 class WebAppShortcutCreator {