Merge "Fix a potential thread safety issue in VectorDrawable" into oc-mr1-dev am: 61cf6455f2 am: 2e440eb0a8 am: 92ed82502c am: 454c79f710 am: 9ed0a05460 am: babf7fabc3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14880620

Change-Id: I942550800d1c46d12f3799f2e9d2f3f23da1ea89