performance test initial work

- pts build added (not yet pulled by cts)

- cts-tradefed has PTS mode where binary is under android-pts

- performance measurement is delivered to host by throwing exception!
  : This can reduce the amount of code duplication as all existing
    instrumentation test code can be re-used.
    When performance test throws PtsException, it is treated as PASS and
    the message is stored to the xml.

- UI scrolling performance
  : scroll 10k list from top to bottom and measure time

- File system performance
  : sequential write, sequential read, update
    update with almost full disk
    actural disk I/O can be checked by monitoring /proc/self/io
    if kernel supports it. But it is only for debugging

Change-Id: Id83988fe34b6040bc20c98061a2b4f3d2f878b86
34 files changed