Merge "Increase size of the back/ime switcher buttons in gesture nav" into sc-dev am: 68839f4b am: 7f029031

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14491497

Change-Id: I482aad5b12424ff9c9acab382bca3d0a1de90025