17cc821c28
We need the icon to be full alpha during the init pass, then when
the actual animation starts, we can swap the icon with the window
(splash screen that draws the icon).
Bug: 192366079
Test: slow down window animations
check no empty frame on cold start app launch
check no empty frame on warm start app launch
Change-Id: I16a1779e5252d8e88bc3c408e1dc40b264fe4cf4