Merge "Cache window and icon color of splash screen starting window" into sc-dev am: 00d26d71 am: de4577a2

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

Change-Id: I87e85e10103fc0f1d8b3a85ebb2adc63ae224ea0