GitLab

Currently fcm channel and subscription to topics use same enum in order to track their
state. This Cl introduces separate enum for the Fcm channel state tracking.

Bug: 801985, 878446

Change-Id: I4a462414852d9bc77c45da125c2a0598afffa8e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1502912
Commit-Queue: Tatiana Gornak <melandory@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637835}