Merge "Scale the preview content from full preview size to match the container...

Merge "Scale the preview content from full preview size to match the container size" into ub-launcher3-master am: 247d7e02

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/ThemePicker/+/11530679

Change-Id: I71747091acfd0c6bbd116a2063d8f602e4eb1bb0