Merge "Add support for latching unsignaled buffers in Skia RenderEngine." into sc-qpr1-dev am: 81274cba0f am: 6333094e81

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15793630

Change-Id: I6ad0fee1ba6816364eb0728d12e41f4231be8af0