Merge "webkit: Add note about HttpAuthHandler being called from Ui" into udc-dev am: 0454dcacdc am: e4191ae90a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22094726

Change-Id: I3e09d568c49d4c499778a01812d6be2d4904cd59
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>