Merge "Revert "Don't clear timestamps when enabling HW vsync."" into...

Merge "Revert "Don't clear timestamps when enabling HW vsync."" into udc-qpr-dev am: 17c5b081 am: 820ff386

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/23753602



Change-Id: Id4c10851c4c740d5f72fd2182ee658a244ae424c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>