Disable VK overscroll for login/out-of-box.

chrome/browser/resources/login/display_manager.js

 // Copyright 2014 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 Display manager for WebUI OOBE and login.
  */
 
 // TODO(xiyuan): Find a better to share those constants.
 /** @const */ var SCREEN_OOBE_NETWORK = 'connect';
@@ skipping 155 matching lines @@
      */
     allowToggleVersion_: false,
 
     /**
      * Whether keyboard navigation flow is enforced.
      * @type {boolean}
      */
     forceKeyboardFlow_: false,
 
     /**
+     * Whether virtual keyboard is shown.
+     * @type {boolean}
+     */
+    virtualKeyboardShown_: false,
+
+    /**
      * Type of UI.
      * @type {string}
      */
     displayType_: DISPLAY_TYPE.UNKNOWN,
 
     /**
      * Error message (bubble) was shown. This is checked in tests.
      */
     errorMessageWasShownForTesting_: false,
 
@@ skipping 33 matching lines @@
      */
     get headerHidden() {
       return $('login-header-bar').hidden;
     },
 
     set headerHidden(hidden) {
       $('login-header-bar').hidden = hidden;
     },
 
     /**
+     * Virtual keyboard state (hidden/shown).
+     * @param {boolean} hidden Whether keyboard is shown.
+     */
+    get virtualKeyboardShown() {
+      return this.virtualKeyboardShown_;
+    },
+
+    set virtualKeyboardShown(shown) {
+      this.virtualKeyboardShown_ = shown;
+    },
+
+    /**
      * Toggles background of main body between transparency and solid.
      * @param {boolean} solid Whether to show a solid background.
      */
     set solidBackground(solid) {
       if (solid)
         document.body.classList.add('solid');
       else
         document.body.classList.remove('solid');
     },
 
@@ skipping 463 matching lines @@
       chrome.send('setDeviceRequisition', [value == '' ? 'none' : value]);
     },
 
     /**
      * Called when window size changed. Notifies current screen about change.
      * @private
      */
     onWindowResize_: function() {
       var currentScreenId = this.screens_[this.currentStep_];
       var currentScreen = $(currentScreenId);
-      if (currentScreen)
+      if (currentScreen && currentScreen.onWindowResize)

[dzhioev (left Google), 2014/05/21 17:30:32]

Added check is not needed, because we have default implementation of
|onWindowResize| in Screen prototype.

[Nikita (slow), 2014/05/22 15:11:50]

Cool, removed.

         currentScreen.onWindowResize();
     },
 
     /*
      * Updates the device requisition string shown in the requisition prompt.
      * @param {string} requisition The device requisition.
      */
     updateDeviceRequisition: function(requisition) {
       this.deviceRequisition_ = requisition;
     },
@@ skipping 243 matching lines @@
    */
   DisplayManager.refocusCurrentPod = function() {
     $('pod-row').refocusCurrentPod();
   };
 
   // Export
   return {
     DisplayManager: DisplayManager
   };
 });