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

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

Change-Id: I685e5c289ae8b549d48ba4510f868a79c5c93688