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
Commit-Queue: Andrew Xu <>
Reviewed-by: Mitsuru Oshima <>
Cr-Commit-Position: refs/heads/master@{#652410}
7 files changed