Merge "[Unfold Animation] Expose hinge angle provider interface" into tm-qpr-dev am: 91a76fbd

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21547693



Change-Id: I02ad9f27fe494f0583e6fea1b36c9f88be3b1aa4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>