Merge "Set GroupedTaskView child thumbnails in onMeasure" into sc-v2-dev am: ca549695aa am: 6a976df53e

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15822489

Change-Id: Id72a03749351dd6834cb10f4a59fdc02506ccf88