Fix cropped floating gesture candidate window

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/aura/window_observer.h"
@@ skipping 44 matching lines @@
   ~KeyboardControllerProxy() override;
 
   // Gets the virtual keyboard window.  Ownership of the returned Window remains
   // with the proxy.
   virtual aura::Window* GetKeyboardWindow();
 
   // 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.
   virtual bool HasKeyboardWindow() const;
 
+  // Whether this window should do an overscroll to avoid occlusion by the
+  // virtual keyboard. IME windows and virtual keyboard windows should always
+  // avoid overscroll.
+  virtual bool ShouldWindowOverscroll(aura::Window* window) const;
+
   // Gets the InputMethod that will provide notifications about changes in the
   // text input context.
   virtual ui::InputMethod* GetInputMethod() = 0;
 
   // Requests the audio input from microphone for speech input.
   virtual void RequestAudioInput(content::WebContents* web_contents,
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback) = 0;
 
   // Shows the container window of the keyboard. The default implementation
@@ skipping 67 matching lines @@
 
   scoped_ptr<content::WebContents> keyboard_contents_;
   scoped_ptr<wm::Shadow> shadow_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardControllerProxy);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_PROXY_H_