GitLab

Refactor detection of offline connections for the purpose of
offline indicator to a separate class.

This class also handles the logic of waiting for 2 seconds after the
connection is offline before notifying the offline indicator class.
If the connection is online, then the indicator class is notified
immediately.

In the next CL, this class would also handle the logic of
holding on to the notification when Chrome is brought to
the foreground (see crbug.com/1093574)

Change-Id: I3368fce894b1fa2dfda3efce3fef5c3764c7217b
Bug: 1084740
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2240899
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Jian Li <jianli@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Sinan Sahin <sinansahin@google.com>
Cr-Commit-Position: refs/heads/master@{#779670}