cros: Allow user to configure note taking app in md-settings.

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 45 matching lines @@
 
     /** Requests a power status update. */
     updatePowerStatus: function() {},
 
     /**
      * Sets the ID of the power source to use.
      * @param {string} powerSourceId ID of the power source. '' denotes the
      *     battery (no external power source).
      */
     setPowerSource: function(powerSourceId) {},
+
+    /**
+     * |callback| is run when there is new note-taking app information
+     * available or after |requestNoteTakingApps| has been called.
+     * @param {function(Array<{name:string, value:string, preferred:boolean}>,
+     *     boolean):void} callback Callback to run.
+     */
+    onNoteTakingAppsUpdated: function(callback) {},
+
+    /**
+     * 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.
+     */
+    setPreferredNoteTakingApp: function(appId) {},
   };
 
   /**
    * @constructor
    * @implements {settings.DevicePageBrowserProxy}
    */
   function DevicePageBrowserProxyImpl() {}
   cr.addSingletonGetter(DevicePageBrowserProxyImpl);
 
   DevicePageBrowserProxyImpl.prototype = {
@@ skipping 22 matching lines @@
 
     /** @override */
     updatePowerStatus: function() {
       chrome.send('updatePowerStatus');
     },
 
     /** @override */
     setPowerSource: function(powerSourceId) {
       chrome.send('setPowerSource', [powerSourceId]);
     },
+
+    /** @override */
+    onNoteTakingAppsUpdated: function(callback) {
+      cr.addWebUIListener('onNoteTakingAppsUpdated', callback);
+    },

[stevenjb, 2017/01/25 01:40:08]

Hmm. I haven't seen this done as a proxy before. I would expect the usage to be
more like:

proxy_.addListener('onNoteTakingAppsUpdated', callback)

Or

proxy_.setNoteTakingAppsUpdatedCallback(callback)

[jdufault, 2017/02/03 21:32:08]

Done.

+
+    /** @override */
+    requestNoteTakingApps: function() {
+      chrome.send('requestNoteTakingApps');
+    },
+
+    /** @override */
+    setPreferredNoteTakingApp: function(appId) {
+      chrome.send('setPreferredNoteTakingApp', [appId]);
+    },
   };
 
   return {
     DevicePageBrowserProxy: DevicePageBrowserProxy,
     DevicePageBrowserProxyImpl: DevicePageBrowserProxyImpl,
   };
 });