[Cronet] Add test jni lib am: 4a755a7a99

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2498162

Change-Id: I20f7bf83a1c07ab23b9e916f0dd35252a31ad4c1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>