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packet on new path. The manager will send out a new connectivity probing
packet if there is no response from the server on the probed path. The
manager will retry after a silent period from the previous sent event with
exponential backoff.
1 unit timeout is the smaller of 2 smoothed rtt from old path, or 600ms.


Bug: 774622
Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I623b8a5aa8da6d553ca16d9f67655d4a32a4a1c9
Reviewed-on: https://chromium-review.googlesource.com/774299
Commit-Queue: Zhongyi Shi <zhongyi@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517737}