Merge changes from topics "taskbar3Button", "taskbarIME" into sc-dev am: b2993d65b7 am: f5f6fd0e21

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14215248

Change-Id: I599bd74665785c1d5e55b8f469355823c8736f6c