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Adding include_canonical_name and loopback_only to the optional
parameters struct.  These will be equivalent to HOST_RESOLVER_CANONNAME
and HOST_RESOLVER_LOOPBACK_ONLY from the old API.  And at least for now,
they'll be implemented by converting to the old flags for simple
compatibility with the current implementation of HostCache::Key.

Added canonical name support to the mojo AddressList as it was missing.

Bug: 821021
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I7ff288f05d6a13e1c6c3c293d9f7a1064f011380
Reviewed-on: https://chromium-review.googlesource.com/1179996
Commit-Queue: Eric Orth <ericorth@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584500}