[automerger skipped] Merge "Added javadoc to apn retry \ throttling related methods" am: 6fccdbb8 am: aab35646 am: a845bbaa -s ours

am skip reason: Change-Id I35a3b97f3e52eef68310a92178bb14495641c6e7 with SHA-1 8cba5a0f is in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1598494

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib52adc497dd8f6af88a31b05719b0ef089ffefc4