Adds MD ink ripple animations to buttons within location bar

ui/views/controls/button/button.h

Index: ui/views/controls/button/button.h
diff --git a/ui/views/controls/button/button.h b/ui/views/controls/button/button.h
index 0f1160b11f1c5563efb43f12ea17fb9fc0f4b8da..8b03be3c68e5548c780112cd074adf5962ab1fa3 100644
--- a/ui/views/controls/button/button.h
+++ b/ui/views/controls/button/button.h
@@ -8,6 +8,7 @@
 #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 {
 
@@ -26,7 +27,7 @@ class VIEWS_EXPORT 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 {
  public:
   ~Button() override;