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

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

Change-Id: I2ee6ce03bb0a9cd96d47605cb0193c8780c4d5c8