Restore screen work area after login

ui/keyboard/keyboard_controller_proxy.h

 // Copyright (c) 2013 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 UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_
 #define UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/common/media_stream_request.h"
 #include "ui/base/ime/text_input_type.h"
@@ skipping 26 matching lines @@
   // Gets the virtual keyboard window.  Ownership of the returned Window remains
   // with the proxy.
   virtual aura::Window* GetKeyboardWindow();
 
   // Sets the override content url.
   void SetOverrideContentUrl(const GURL& url);
 
   // Whether the keyboard window is resizing from its web contents.
   bool resizing_from_contents() const { return resizing_from_contents_; }
 
+  // Whether the keyboard window is created. The keyboard window is tied to a
+  // WebContent so we can just check if the WebContent is created or not.
+  bool HasKeyboardWindow() const { return keyboard_contents_; }
+
   // Sets the flag of whether the keyboard window is resizing from
   // its web contents.
   void set_resizing_from_contents(bool resizing) {
     resizing_from_contents_ = resizing;
   }
 
   // Gets the InputMethod that will provide notifications about changes in the
   // text input context.
   virtual ui::InputMethod* GetInputMethod() = 0;
 
@@ skipping 46 matching lines @@
 
   // Whether the current keyboard window is resizing from its web content.
   bool resizing_from_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardControllerProxy);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_