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: I3250c533571e6b371de81e75fc8094a5b3c59d8e