Create Dns-over-HTTPS templates policy

The templates policy is used to specify URI templates for the
DNS-over-HTTPS resolver.

Bug: 1016539
Change-Id: If87498ddabac8b6f1cbd45dae0500b4db3949cf8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872629
Commit-Queue: Steven Bingler <[email protected]>
Reviewed-by: Eric Orth <[email protected]>
Reviewed-by: Julian Pastarmov <[email protected]>
Cr-Commit-Position: refs/heads/master@{#710811}
7 files changed