Merge "Introduce DreamLog using LogBuffer." into udc-dev am: 93b092bdd7 am: 42bea1e2e0

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22497378

Change-Id: I42b1414212cc85a0f6d8c0745b48e5a957768055
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>