Merge "[VCN06] Support request background network" am: a18490bdde am: 1856a60c7b am: 645596b998

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1545847

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I12d2cbe4a5fc10a7ec7abf8038c088fe13b02d59