GitLab

Everything in the struct should have a reasonable default value and the
struct param itself is optional using base::Optional.

Include DNS qtype and initial priority support in the new parameter.
Lots of tests added in now that qtype and priority are supported by the
new API.

I'll add a similar struct of optional params to the mojo API in the next
CL.

Bug: 821021
Cq-Include-Trybots: luci.chromium.try:linux_mojo;master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I4b628364e53f1c3fdf34819071b6562eaedc9c14
Reviewed-on: https://chromium-review.googlesource.com/1171574
Commit-Queue: Eric Orth <ericorth@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583418}