Revert "Merge "Revert "Use wallpaper colors for widgets in wallpaper change preview"" into sc-dev"

This reverts commit 7de95d67, reversing
changes made to 0a70a5a6.

Lints have been added to fix errorprone.

Test: Widgets should adapt to wallpaper colors in launcher preview.
Bug: 192205054
Merged-In: I3fb76b6036cb909771b789eac15742df78c2c742
Merged-In: I4da9ad1cc88be251f97e86b6c8c9b346ed20f586
Change-Id: I6866f8521ed427d096f27da0a92d8b40e1099187