Add PresentationTimeRecorder For Tablet Mode

Add PresentationTimeRecorder to record all tablet mode launcher
gesture interactions, which include:
(1) Swiping from bottom of screen to show launcher
(2) Swiping from top of screen to hide launcher

Test: ash_unittests
Bug: 947105
Change-Id: Ib1d014b1b7141883d9e78035a26cbeeea689c651
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1564880
Commit-Queue: Andrew Xu <andrewxu@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652410}
7 files changed