Reland "cronet: add Android.bp" am: 812a2adf68

Original change: https://android-review.googlesource.com/c/platform/external/cronet/+/2376269

Change-Id: I4886b474e5b00f76a63da9282c0dc6019463ed5e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>