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

chrome/browser/chromeos/login/ui/login_display.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 150 matching lines @@
   // Show password changed dialog. If |show_password_error| is not null
   // user already tried to enter old password but it turned out to be incorrect.
   virtual void ShowPasswordChangedDialog(bool show_password_error) = 0;
 
   // Shows signin UI with specified email.
   virtual void ShowSigninUI(const std::string& email) = 0;
 
   // Hides or shows login UI control bar with [Shut down] / [Add user] buttons.
   virtual void ShowControlBar(bool show) = 0;
 
+  // Sets the virtual keyboard state.
+  virtual void SetKeyboardState(bool shown) = 0;
+
   gfx::Rect background_bounds() const { return background_bounds_; }
   void set_background_bounds(const gfx::Rect& background_bounds) {
     background_bounds_ = background_bounds;
   }
 
   Delegate* delegate() { return delegate_; }
   void set_delegate(Delegate* delegate) { delegate_ = delegate; }
 
   gfx::NativeWindow parent_window() const { return parent_window_; }
   void set_parent_window(gfx::NativeWindow window) { parent_window_ = window; }
@@ skipping 18 matching lines @@
   // in redesigned login stack.
   // Login stack (and this object) will be recreated for next user sign in.
   bool is_signin_completed_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginDisplay);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_DISPLAY_H_