Adds MD ink ripple animations to buttons within location bar

ui/views/controls/button/button.h

 // Copyright (c) 2011 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_BUTTON_H_
 #define UI_VIEWS_CONTROLS_BUTTON_BUTTON_H_
 
 #include "base/macros.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/view.h"
+#include "ui/views/widget/widget_observer_view.h"
 
 namespace views {
 
 class Button;
 class Event;
 
 // An interface implemented by an object to let it know that a button was
 // pressed.
 class VIEWS_EXPORT ButtonListener {
  public:
   virtual void ButtonPressed(Button* sender, const ui::Event& event) = 0;
 
  protected:
   virtual ~ButtonListener() {}
 };
 
 // A View representing a button. Depending on the specific type, the button
 // could be implemented by a native control or custom rendered.
-class VIEWS_EXPORT Button : public View {
+class VIEWS_EXPORT Button : public WidgetObserverView {

[sadrul, 2016/01/28 17:45:06]

We shouldn't do this, of course.

[varkha, 2016/01/28 20:09:19]

Done.

  public:
   ~Button() override;
 
   // Button states for various button sub-types.
   enum ButtonState {
     STATE_NORMAL = 0,
     STATE_HOVERED,
     STATE_PRESSED,
     STATE_DISABLED,
     STATE_COUNT,
@@ skipping 48 matching lines @@
   // The id tag associated with this button. Used to disambiguate buttons in
   // the ButtonListener implementation.
   int tag_;
 
   DISALLOW_COPY_AND_ASSIGN(Button);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_BUTTON_H_