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This new field represents whether a host resolution error resulted
directly from a DNS-over-HTTPS attempt. It will be used in future cls to
prepare the error page for secure DNS errors and to trigger captive
portal probes. Note that if a result was obtained from the cache this
field will be false, regardless of whether the result was originally
obtained securely, because this field is intended to identify secure
DNS *network* failures.

Bug: 1037899
Change-Id: I21b8afaeb103f12d7d572f8cf8b29d2e1228d007
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978106
Commit-Queue: Katharine Daly <dalyk@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727821}