Force save changes when Enter is pressed for the controls with buffered updates.

chrome/browser/resources/print_preview/previewarea/margin_control.js

 // Copyright (c) 2012 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.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Draggable control for setting a page margin.
    * @param {!print_preview.ticket_items.CustomMargins.Orientation} orientation
@@ skipping 403 matching lines @@
      * Called when a key down event occurs on the textbox. Dispatches a
      * TEXT_CHANGE event if the "Enter" key was pressed.
      * @param {Event} event Contains the key that was pressed.
      * @private
      */
     onTextboxKeyDown_: function(event) {
       if (this.textTimeout_) {
         clearTimeout(this.textTimeout_);
         this.textTimeout_ = null;
       }
-      if (event.keyIdentifier == 'Enter') {
+      if (event.keyCode == 13 /*enter*/) {
         this.preTimeoutValue_ = null;
         cr.dispatchSimpleEvent(this, MarginControl.EventType.TEXT_CHANGE);
       } else {
         if (this.preTimeoutValue_ == null) {
           this.preTimeoutValue_ = this.textbox_.value;
         }
         this.textTimeout_ = setTimeout(
             this.onTextboxTimeout_.bind(this), MarginControl.TEXTBOX_TIMEOUT_);
       }
     },
@@ skipping 23 matching lines @@
       this.setIsFocused_(false);
       cr.dispatchSimpleEvent(this, MarginControl.EventType.TEXT_CHANGE);
     }
   };
 
   // Export
   return {
     MarginControl: MarginControl
   };
 });