Merge "Defer deleting ExternalTextures that go out of scope during DrawLayers" into sc-dev am: d966a695b5

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/14948686

Change-Id: Ib32b7171ddf0d45dc0c5520ddeca79b7ea8c17d3