Merge "Introduce DreamLog using LogBuffer." into udc-dev am: 3022b9ce am: 1662dbf5 am: 327ac0f6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22819903



Change-Id: I76abc55d90f105e0f2b48b79aff10a65c7119542
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>