Merging ub-launcher3-master, build 5434161

Test: Manual

Bug:127840207 [logging] quickswitch usage
Bug:127848641 [logging] (left|right) back gesture / home gesture usage
Bug:128711026 [Gesture Nav] widgets and icons are clipped
Bug:129337684 Swipe up from home falses to Overview
Bug:129711952 Overview stays in view hierarchy while in all apps
Bug:129723135 Broken tests: swipe from killed launcher doesn't open overview
Bug:129867977 [gestural nav] Add assistant gesture logging

Change-Id: I5a47424b0eb6cadbb8e3ced037fe5913302e6afa