Mutable Partial Network Traffic Annotation Tag Mojo interface added.

Mojo interface added for MutablePartialNetworkTrafficAnnotationTag.
This interface is now required for
public_ip_address_geolocation_provider and will also be required for
all Mojo interfaces that pass a partial network traffic annotation tag.

Bug: 656607
Change-Id: I61dd345a0a60166413c2126c89098e9e1f031f43
Reviewed-on: https://chromium-review.googlesource.com/787250
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Renjie Liu <renjieliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520484}
12 files changed