Fix cropped floating gesture candidate window

ash/test/test_keyboard_ui.cc

 // 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.
 
 #include "ash/test/test_keyboard_ui.h"
 
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/base/ime/mock_input_method.h"
 
 namespace ash {
 
 TestKeyboardUI::TestKeyboardUI() {}
 TestKeyboardUI::~TestKeyboardUI() {}
 
 bool TestKeyboardUI::HasKeyboardWindow() const {
   return keyboard_;
 }
 
+bool TestKeyboardUI::ShouldWindowOverscroll(aura::Window* window) const {
+  return true;
+}
+
 aura::Window* TestKeyboardUI::GetKeyboardWindow() {
   if (!keyboard_) {
     keyboard_.reset(new aura::Window(&delegate_));
     keyboard_->Init(ui::LAYER_NOT_DRAWN);
   }
   return keyboard_.get();
 }
 
 ui::InputMethod* TestKeyboardUI::GetInputMethod() {
   aura::Window* active_window = wm::GetActiveWindow();
   aura::Window* root_window = active_window ? active_window->GetRootWindow()
                                             : Shell::GetPrimaryRootWindow();
   return root_window->GetHost()->GetInputMethod();
 }
 
 void TestKeyboardUI::SetUpdateInputType(ui::TextInputType type) {}
 void TestKeyboardUI::ReloadKeyboardIfNeeded() {}
 void TestKeyboardUI::InitInsets(const gfx::Rect& keyboard_bounds) {}
 void TestKeyboardUI::ResetInsets() {}
 
 }  // namespace ash