Update gRPC Java Testing Lib to build Host and Android clients. am: a97c369d0c am: 400d5deff6

Original change: https://android-review.googlesource.com/c/platform/external/grpc-grpc-java/+/1531218

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7a7d0a98c4afc0964d0f6d2324c5b04d26ce466e