Adds MD ink ripple animations to buttons within location bar

ui/views/controls/image_view.h

Index: ui/views/controls/image_view.h
diff --git a/ui/views/controls/image_view.h b/ui/views/controls/image_view.h
index 401289a76ccf265c637e389fa407568b55f23585..b3b762bcd432cf81435916397445636d8b738b94 100644
--- a/ui/views/controls/image_view.h
+++ b/ui/views/controls/image_view.h
@@ -50,9 +50,9 @@ class VIEWS_EXPORT ImageView : public View {
   // image.
   void SetImage(const gfx::ImageSkia* image_skia);
 
-  // Returns the image currently displayed or NULL of none is currently set.
+  // Returns the image currently displayed, which can be empty if not set.
   // The returned image is still owned by the ImageView.
-  const gfx::ImageSkia& GetImage();
+  const gfx::ImageSkia& GetImage() const;
 
   // Set the desired image size for the receiving ImageView.
   void SetImageSize(const gfx::Size& image_size);