Delay hiding the cast icon for 3 seconds. DO NOT MERGE

Ensure that the user has had a chance to see it for a few
seconds after screen recording has ended.

(cherry picked from commit 8fd25bf7711aabffe73213ba1f9056f285270695)

Bug: 19121797
Change-Id: I7a5c12b371b735c756ca5a3e8716c385fb3fbfe9
1 file changed