Merge "Wait for data to be available before reading." into sc-dev am: 527d6d6a am: 81d9e76c am: afe59fa4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15182761

Change-Id: Icb5852ac761431b4cab2b9d35a9c5b7f8530a3e2