[Cronet] Add test jni lib am: 4a755a7a99

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

Change-Id: I5541a818dca8a127548532e9af7088e10e9e672d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>