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

chrome/browser/resources/chromeos/login/login_common.js

Index: chrome/browser/resources/chromeos/login/login_common.js
diff --git a/chrome/browser/resources/chromeos/login/login_common.js b/chrome/browser/resources/chromeos/login/login_common.js
index 46eeb7fac43b470fba8fbdbfa513a4b02ddf1d35..bac3846076eeaa62a7eedc8505e14d88e46ebac8 100644
--- a/chrome/browser/resources/chromeos/login/login_common.js
+++ b/chrome/browser/resources/chromeos/login/login_common.js
@@ -320,6 +320,22 @@ cr.define('cr.ui', function() {
     Oobe.getInstance().headerHidden = !show;
   };
 
+  /**
+   * Sets the current state of the virtual keyboard (shown/hidden).
+   */
+  Oobe.setKeyboardState = function(shown) {
+    Oobe.getInstance().virtualKeyboardShown = shown;
+  };
+
+  /**
+   * Sets the current size of the client area (display size).
+   * @param {number} width client area width
+   * @param {number} height client area height
+   */
+  Oobe.setClientAreaSize = function(width, height) {
+    Oobe.getInstance().setClientAreaSize(width, height);
+  };
+
   // Export
   return {
     Oobe: Oobe