Merge "Enable dimming for mid-range luminance wallpapeprs." into sc-dev am:...

Merge "Enable dimming for mid-range luminance wallpapeprs." into sc-dev am: 4bb78410 am: 391d414b am: 4ec7b7a1

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14881020

Change-Id: I8890c963e02d6b21f27b09fb049e9f88b6306b5a