Collect statistics of source build version
Collect statistics of source build version

Parse the last_install and report the source build version of an ota
update.
Related CL in: ag/1121141

Bug: 28658632
Change-Id: I5e835c144aabe97fda681f60397ebf4416f7bd4f

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base