fps_meter: Add verbose mode to print detailed frame time

Sample output:
$ fps_meter.py -v
trace method: workq
[ 1   1  1                                                   ] FPS: 3
23.292, 23.346, 23.393

BUG=chromium:805780
TEST=manually run verbose mode

Change-Id: I334bc597af6a0b655dd82460bc2b7667e077f6a3
Reviewed-on: https://chromium-review.googlesource.com/913629
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Vovo Yang <vovoy@chromium.org>
Reviewed-by: Cheng-Yu Lee <cylee@google.com>
Reviewed-by: Yury Khmel <khmel@google.com>
1 file changed
tree: becaddc3fe47297d194ab3b9728d849feb0bc429
  1. README
  2. fps_meter/
  3. power-model/