Update activity indicator from a light bar to a point

ash/shelf/shelf_button.h

Index: ash/shelf/shelf_button.h
diff --git a/ash/shelf/shelf_button.h b/ash/shelf/shelf_button.h
index 4a84a61a532d502bb5d7a60e0047ef4beea274a6..c59153bf35e1004b011392be2aa94ebe5691a24c 100644
--- a/ash/shelf/shelf_button.h
+++ b/ash/shelf/shelf_button.h
@@ -90,6 +90,9 @@ class ASH_EXPORT ShelfButton : public views::CustomButton {
   // Updates the status bar (bitmap, orientation, visibility).
   void UpdateBar();
 
+  // Creates an activity indicator image.
+  void GetIndicatorImage(gfx::Canvas& canvas);

[tdanderson, 2016/05/02 17:58:35]

nit: I would prefer this be called something like "PaintIndicatorImage" instead.
Starting the function name with "Get" is misleading since it isn't returning
anything.

[varkha, 2016/05/02 18:13:59]

Or maybe PaintIndicatorOnCanvas to self-document the parameter.

[yiyix, 2016/05/03 18:55:34]

I agree. I changed it to PaintIndicatorOnCanvas, i found this name is more
descriptive.

+
   // The shelf view hosting this button.
   ShelfView* shelf_view_;