cros: Open play store app for md-settings stylus "Find more apps" link

chrome/browser/resources/settings/device_page/device_page_browser_proxy.js

 // Copyright 2016 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.
 
 /** @fileoverview A helper object used for testing the Device page. */
 cr.exportPath('settings');
 
 /**
  * Mirrors DeviceType from ash/common/system/chromeos/power/power_status.h.
  * @enum {number}
@@ skipping 62 matching lines @@
     setPowerSource: function(powerSourceId) {},
 
     /**
      * |callback| is run when there is new note-taking app information
      * available or after |requestNoteTakingApps| has been called.
      * @param {function(Array<settings.NoteAppInfo>, boolean):void} callback
      */
     setNoteTakingAppsUpdatedCallback: function(callback) {},
 
     /**
+     * Open up the play store with the given URL.
+     * @param {string} url
+     */
+    showPlayStore: function(url) {},
+
+    /**
      * Request current note-taking app info. Invokes any callback registered in
      * |onNoteTakingAppsUpdated|.
      */
     requestNoteTakingApps: function() {},
 
     /**
      * Changes the preferred note taking app.
      * @param {string} appId The app id. This should be a value retrieved from a
      *     |onNoteTakingAppsUpdated| callback.
      */
@@ skipping 45 matching lines @@
     setPowerSource: function(powerSourceId) {
       chrome.send('setPowerSource', [powerSourceId]);
     },
 
     /** @override */
     setNoteTakingAppsUpdatedCallback: function(callback) {
       cr.addWebUIListener('onNoteTakingAppsUpdated', callback);
     },
 
     /** @override */
+    showPlayStore: function(url) {
+      chrome.send('showPlayStoreApps', [url]);
+    },
+
+    /** @override */
     requestNoteTakingApps: function() {
       chrome.send('requestNoteTakingApps');
     },
 
     /** @override */
     setPreferredNoteTakingApp: function(appId) {
       chrome.send('setPreferredNoteTakingApp', [appId]);
     },
   };
 
   return {
     DevicePageBrowserProxy: DevicePageBrowserProxy,
     DevicePageBrowserProxyImpl: DevicePageBrowserProxyImpl,
   };
 });