Merge "Check for taskbar 3 button flag when initializing RotationContextualButton" into sc-v2-dev am: 759490be1d am: e98ef15f9b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14826862

Change-Id: Ida69d5187715603b75eae06fb758ba92fecda614