Update the style of the action bar share UI

1. Made the background of the default and expand buttons change when pressed.

2. When the share UI is shown on the overflow the "Show all" menu item was
   present event if all items are shown.

3. The width of the popup for picking an item was different for the action
   view and overflow case.

bug:5039747

Change-Id: I72afbcf86c93596c7eba4d70c002eab060ff31f8