Merge "Adding shell-internal version of StubTransaction" into udc-dev am: 4204be8b am: 56957d4f am: 32971c17 am: b7d2a42c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23621503



Change-Id: Idb4647f9b2d7cc22805edc5bf2cf89da43e37037
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>