Add user customizable launch type for apps.

chrome/browser/resources/shared/js/cr/ui/command.js

Index: chrome/browser/resources/shared/js/cr/ui/command.js
diff --git a/chrome/browser/resources/shared/js/cr/ui/command.js b/chrome/browser/resources/shared/js/cr/ui/command.js
index 10113982b84282e44e3d72e40ab6472dfb37a56d..61294f3c51faffd05d8b66658e792ffcc3ee0f0e 100644
--- a/chrome/browser/resources/shared/js/cr/ui/command.js
+++ b/chrome/browser/resources/shared/js/cr/ui/command.js
@@ -172,6 +172,12 @@ cr.define('cr.ui', function() {
   cr.defineProperty(Command, 'hidden', cr.PropertyKind.BOOL_ATTR);
 
   /**
+   * Whether the command is checked or not.
+   * @type {boolean}
+   */
+  cr.defineProperty(Command, 'checked', cr.PropertyKind.BOOL_ATTR);
+
+  /**
    * Dispatches a canExecute event on the target.
    * @param {cr.ui.Command} command The command that we are testing for.
    * @param {Element} target The target element to dispatch the event on.