Merge "Merge "New hidden API to support the CTS test case that checks the file contents remains unaltered." into udc-dev am: 0fa26314 am: dcc0acb2 am: 7bce424a" into udc-qpr-dev-plus-aosp am: a65f1c9f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22839500



Change-Id: Ie5f66952bd452ac63c0c71847d0043aea358845f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>