Refactoring to make adding ink drop animations easier

ui/views/animation/test/test_ink_drop_host.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_VIEWS_ANIMATION_TEST_TEST_INK_DROP_HOST_H_
 #define UI_VIEWS_ANIMATION_TEST_TEST_INK_DROP_HOST_H_
 
 #include "base/macros.h"
 #include "ui/views/animation/ink_drop_host.h"
 
 namespace views {
 
 // A non-functional, dummy implementation of an InkDropHost that can be used as
 // a placeholder during tests.
 class TestInkDropHost : public InkDropHost {
  public:
   TestInkDropHost();
   ~TestInkDropHost() override;
 
   // TestInkDropHost:
   void AddInkDropLayer(ui::Layer* ink_drop_layer) override;
   void RemoveInkDropLayer(ui::Layer* ink_drop_layer) override;
+  gfx::Point CalculateInkDropCenter() const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestInkDropHost);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_TEST_TEST_INK_DROP_HOST_H_