Updates touch calibration API and plumbs through the native touch calibration method

chrome/browser/resources/settings/device_page/display.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
  * 'settings-display' is the settings subpage for display settings.
  */
 
 cr.define('settings.display', function() {
@@ skipping 297 matching lines @@
   onSelectDisplayTab_: function(e) {
     this.onSelectDisplay_({detail: e.detail.item.displayId});
   },
 
   /**
    * Handles event when a touch calibration option is selected.
    * @param {!Event} e
    * @private
    */
   onTouchCalibrationTap_: function(e) {
-    settings.display.systemDisplayApi.touchCalibrationStart(
-        this.selectedDisplay.id);
+    settings.display.systemDisplayApi.showNativeTouchCalibration(
+        this.selectedDisplay.id, function(success) {});

[stevenjb, 2017/01/19 17:19:01]

Ideally we should disable the button while touch calibration is in progress and
enable it when it completes. In order to do that robustly however we would also
need to be able to query whether calibration is in progress when we load the UI,
so maybe add a TODO here instead and file a bug for that.

In the meanwhile, if we make the callback optional, no need to pass an empty
function.

[malaykeshav, 2017/01/19 23:49:07]

This would be a safety measure since the calibration UX overlays the entire
screen. And the user cannot interact with anything other than the touch
calibration UX while it is in progress.

   },
 
   /**
    * Handles the event when an option from display select menu is selected.
    * @param {!{target: !HTMLSelectElement}} e
    * @private
    */
   updatePrimaryDisplay_: function(e) {
     /** @const {number} */ var PRIMARY_DISP_IDX = 0;
     if (!this.selectedDisplay)
@@ skipping 104 matching lines @@
   },
 
   /** @private */
   setPropertiesCallback_: function() {
     if (chrome.runtime.lastError) {
       console.error(
           'setDisplayProperties Error: ' + chrome.runtime.lastError.message);
     }
   },
 });