[MD] simplify and unify some ink drop center calculations

ui/views/controls/button/label_button.h

 // Copyright (c) 2012 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_CONTROLS_BUTTON_LABEL_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
@@ skipping 87 matching lines @@
   void SetBorder(scoped_ptr<Border> border) override;
   gfx::Size GetPreferredSize() const override;
   int GetHeightForWidth(int w) const override;
   void Layout() override;
   const char* GetClassName() const override;
   void EnableCanvasFlippingForRTLUI(bool flip) override;
   void AddInkDropLayer(ui::Layer* ink_drop_layer) override;
   void RemoveInkDropLayer(ui::Layer* ink_drop_layer) override;
   scoped_ptr<InkDropAnimation> CreateInkDropAnimation() const override;
   scoped_ptr<InkDropHover> CreateInkDropHover() const override;
+  gfx::Point GetInkDropCenter() const override;
 
  protected:
   ImageView* image() const { return image_; }
   Label* label() const { return label_; }
 
   // Returns the available area for the label and image. Subclasses can change
   // these bounds if they need room to do manual painting.
   virtual gfx::Rect GetChildAreaBounds();
 
   // View:
@@ skipping 96 matching lines @@
   gfx::HorizontalAlignment horizontal_alignment_;
 
   scoped_ptr<Painter> focus_painter_;
 
   DISALLOW_COPY_AND_ASSIGN(LabelButton);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_LABEL_BUTTON_H_