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..c4295fe4f2f94e4c8226d7bd4a0f7974185595ec 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.

[varkha, 2016/05/05 14:40:56]

The comment seems out of date now. How about
"Paints an activity indicator on |canvas| whose |size| is specified in DIP."

[yiyix, 2016/05/10 19:30:00]

Done.

sorry, what is DIP stands for?

+  void PaintIndicatorOnCanvas(gfx::Canvas* canvas, const gfx::Size& size);
+
   // The shelf view hosting this button.
   ShelfView* shelf_view_;