Report mStatistics.count in InputReader

We just added a new field to TouchEventReported, count. The new field
specifies the number of events in a particular report. The reports are
currently in 5-minute chunks.

Report count in InputReader.

Bug: 111431676
Test: out/host/linux-x86/bin/statsd_testdrive 34
Change-Id: I9aa6ac8e81a7764a5268e2cde6c7b4b86e28fbe2