Fix cropped floating gesture candidate window

ui/keyboard/content/keyboard_ui_content.h

 // Copyright 2015 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_CONTENT_KEYBOARD_UI_CONTENT_H_
 #define UI_KEYBOARD_CONTENT_KEYBOARD_UI_CONTENT_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "content/public/common/media_stream_request.h"
 #include "ui/aura/window_observer.h"
@@ skipping 54 matching lines @@
   // Loads system virtual keyboard. Noop if the current virtual keyboard is
   // system virtual keyboard.
   virtual void LoadSystemKeyboard();
 
   // Called when a window being observed changes bounds, to update its insets.
   void UpdateInsetsForWindow(aura::Window* window);
 
   // Overridden from KeyboardUI:
   aura::Window* GetKeyboardWindow() override;
   bool HasKeyboardWindow() const override;
+  bool ShouldWindowOverscroll(aura::Window* window) const override;
   void ReloadKeyboardIfNeeded() override;
   void InitInsets(const gfx::Rect& new_bounds) override;
   void ResetInsets() override;
 
  protected:
   // The implementation can choose to setup the WebContents before the virtual
   // keyboard page is loaded (e.g. install a WebContentsObserver).
   // SetupWebContents() is called right after creating the WebContents, before
   // loading the keyboard page.
   virtual void SetupWebContents(content::WebContents* contents);
 
   // aura::WindowObserver overrides:
   void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowDestroyed(aura::Window* window) override;
 
   content::BrowserContext* browser_context() { return browser_context_; }
 
+  const aura::Window* GetKeyboardRootWindow() const;
+
  private:
   friend class TestApi;
 
   // Loads the web contents for the given |url|.
   void LoadContents(const GURL& url);
 
   // Gets the virtual keyboard URL (either the default URL or IME override URL).
   const GURL& GetVirtualKeyboardUrl();
 
   // Determines whether a particular window should have insets for overscroll.
@@ skipping 13 matching lines @@
   scoped_ptr<content::WebContents> keyboard_contents_;
   scoped_ptr<wm::Shadow> shadow_;
 
   scoped_ptr<WindowBoundsChangeObserver> window_bounds_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardUIContent);
 };
 
 }  // namespace keyboard
 
-#endif  // UI_KEYBOARD_CONTENT_KEYBOARD_UI_CONTENT_H_
+#endif  // UI_KEYBOARD_CONTENT_KEYBOARD_UI_CONTENT_H_