Merge "Merge "Get starting window background color directly." into sc-dev am:...

Merge "Merge "Get starting window background color directly." into sc-dev am: a9a86113 am: 76d20eed" into sc-v2-dev-plus-aosp am: a0962f07

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15020163

Change-Id: Ice7270e6bc1c81faf56e2c1d40ce3af0800f39ba