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Sometimes resolving a host name will result in ERR_NAME_NOT_RESOLVED even
though the host still should resolve.  This change adds an option to use
stale DNS results in these cases.

Bug: 875845

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I02b7a122bb9236f9ff47c73af8e4803315dcd382
Reviewed-on: https://chromium-review.googlesource.com/1179998
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Reviewed-by: Misha Efimov <mef@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584772}