Merge "Make sure we check for valid GrContext when pinning images." into...

Merge "Make sure we check for valid GrContext when pinning images." into sc-dev am: 351080a8 am: ae13e5ca

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15156074

Change-Id: Ib4822c0ff98fc3460c1d0209b83a3dc3232491ee