Create utility function for configuring an ImageButton to use a vector

ui/views/controls/button/image_button.h

Index: ui/views/controls/button/image_button.h
diff --git a/ui/views/controls/button/image_button.h b/ui/views/controls/button/image_button.h
index eba2a835a40eff5f07a628558b2fe1fd5ad48b16..1c640aae946334e42e20dd0bfcf4c9f583922f4e 100644
--- a/ui/views/controls/button/image_button.h
+++ b/ui/views/controls/button/image_button.h
@@ -13,6 +13,10 @@
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/controls/button/custom_button.h"
 
+namespace gfx {
+struct VectorIcon;
+}
+
 namespace views {
 
 class Painter;
@@ -170,6 +174,12 @@ class VIEWS_EXPORT ToggleImageButton : public ImageButton {
   DISALLOW_COPY_AND_ASSIGN(ToggleImageButton);
 };
 
+// Sets up |button| as a button that displays an ink drop and a vector icon.
+// TODO(estade): find the right place for this utility.
+void VIEWS_EXPORT SetImageFromVectorIcon(ImageButton* button,
+                                         const gfx::VectorIcon& icon,
+                                         SkColor base_color);
+
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_BUTTON_IMAGE_BUTTON_H_