Merge "Add check for empty vsync data in Choreographer." into tm-dev am: c2c8ac85 am: c0b5c6cc

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17920025



Change-Id: I71106d66c89c5d7198967b4a52a44e815e3d2395
Ignore-AOSP-First: this is an automerge
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>