Merge "Log various types of back gesture using StatsLog Bug: 135152789 Test: m statsd_testdrive -j31 Test: out/host/linux-x86/bin/statsd_testdrive 224" into qt-r1-dev
am: fa38ed5296

Change-Id: I041ce68d7534c70e8c96c2667437a6b0fa411ee8