Merge "Cronet: add test for handling post request" am: 09b8b28712

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2337486

Change-Id: I0b84b6094c696d3a8d7f85eb5ba88b9b8d80196f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>