Fix cropped floating gesture candidate window

ash/test/test_keyboard_ui.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 ASH_TEST_TEST_KEYBOARD_UI_H_
 #define ASH_TEST_TEST_KEYBOARD_UI_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/keyboard/keyboard_ui.h"
 
 namespace aura {
 class Window;
 }  // namespace aura
 
 namespace ash {
 
 // Stub implementation of keyboard::KeyboardUI
 class TestKeyboardUI : public keyboard::KeyboardUI {
  public:
   TestKeyboardUI();
   ~TestKeyboardUI() override;
 
   bool HasKeyboardWindow() const override;
+  bool ShouldWindowOverscroll(aura::Window* window) const override;
   aura::Window* GetKeyboardWindow() override;
 
  private:
   // Overridden from keyboard::KeyboardUI:
   ui::InputMethod* GetInputMethod() override;
   void SetUpdateInputType(ui::TextInputType type) override;
   void ReloadKeyboardIfNeeded() override;
   void InitInsets(const gfx::Rect& keyboard_bounds) override;
   void ResetInsets() override;
 
   aura::test::TestWindowDelegate delegate_;
   scoped_ptr<aura::Window> keyboard_;
   DISALLOW_COPY_AND_ASSIGN(TestKeyboardUI);
 };
 
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_KEYBOARD_UI_H_