Merge "Cache window and icon color of splash screen starting window" into...

Merge "Cache window and icon color of splash screen starting window" into sc-dev am: 00d26d71 am: 70543860 am: 3f3232d6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14842877

Change-Id: Iebf74084e56e0729b0acd96389be83eb744049d5