Color extraction on scrims

Consuming color extraction library to add wallpaper
colors to sysui scrims. Handles both lock screen and
notification shade.

Bug: 36856508
Bug: 37013527
Test: runtest --path frameworks/base/packages/SystemUI/tests/src/com/android/systemui/statusbar/ScrimViewTest.java
Change-Id: I8d964c978a766243d90bbfb3432d19eebf1a2056