Adds the touch calibration setting behind a chrome switch

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 148 matching lines @@
       this.selectedModeIndex_ = 0;
       this.currentSelectedModeIndex_ = 0;
       return;
     }
     this.modeValues_ = Array.from(Array(numModes).keys());
     this.selectedModeIndex_ = this.getSelectedModeIndex_(this.selectedDisplay);
     this.currentSelectedModeIndex_ = this.selectedModeIndex_;
   },
 
   /**
+   * Returns true if the given display has touch support and is not an internal
+   * display. If the feature is not enabled via the switch, this will return
+   * false.
+   * @param {!chrome.system.display.DisplayUnitInfo} display Display being
+   *     checked for touch support.
+   * @return {boolean}
+   * @private
+   */
+  showTouchCalibrationSetting_: function(display) {
+    return !display.isInternal && display.hasTouchSupport &&
+        loadTimeData.getBoolean('enableTouchCalibrationSetting');
+  },
+
+  /**
    * @param {!Array<!chrome.system.display.DisplayUnitInfo>} displays
    * @return {boolean}
    * @private
    */
   showDisplayTabMenu_: function(displays) {
     return displays.length > 1;
   },
 
   /**
    * Returns false if the display select menu has to be hidden.
@@ skipping 110 matching lines @@
   /**
    * Handles event when a display tab is selected.
    * @param {!{detail: !{item: !{displayId: string}}}} e
    * @private
    */
   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);
+  },
+
+  /**
    * 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)
       return;
     if (this.selectedDisplay.id == this.primaryDisplayId)
       return;
@@ skipping 101 matching lines @@
   },
 
   /** @private */
   setPropertiesCallback_: function() {
     if (chrome.runtime.lastError) {
       console.error(
           'setDisplayProperties Error: ' + chrome.runtime.lastError.message);
     }
   },
 });