MD Settings: Make Escape blur and undo changes to input fields.

chrome/browser/resources/settings/controls/settings_input.js

 // Copyright 2015 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-input` is a single-line text field for user input associated
  * with a pref value.
  */
 Polymer({
@@ skipping 52 matching lines @@
    */
   prefChanged_: function() {
     if (!this.pref)
       return;
 
     // Ignore updates while the input is focused so that user input is not
     // overwritten.
     if (this.$.input.focused)
       return;
 
+    this.setInputValueFromPref_();
+  },
+
+  /** @private */
+  setInputValueFromPref_: function() {
     if (this.pref.type == chrome.settingsPrivate.PrefType.NUMBER) {
       this.value = this.pref.value.toString();
     } else {
       assert(this.pref.type == chrome.settingsPrivate.PrefType.STRING ||
              this.pref.type == chrome.settingsPrivate.PrefType.URL);
       this.value = /** @type {string} */(this.pref.value);
     }
   },
 
   /**
@@ skipping 28 matching lines @@
       }
       this.set('pref.value', n);
     } else {
       assert(this.pref.type == chrome.settingsPrivate.PrefType.STRING ||
              this.pref.type == chrome.settingsPrivate.PrefType.URL);
       this.set('pref.value', this.value);
     }
   },
 
   /**
+   * Handler for profile name keydowns.
+   * @param {!Event} event
+   * @private
+   */
+  onKeydown_: function(event) {
+    if (event.key != 'Escape')
+      return;
+
+    this.setInputValueFromPref_();
+    this.$.input.blur();
+  },
+
+  /**
    * @param {boolean} disabled
    * @return {boolean} Whether the element should be disabled.
    * @private
    */
   isDisabled_: function(disabled) {
     return disabled || this.isPrefEnforced();
   },
 });