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

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



Change-Id: Ib77e6da2a2fea91fd5b4d8fec6eacaf07c935429
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>