Issue 825265  has been merged into this issue.

Taking this one assuming no one is working on it.

Marking as available since my other bug is taking longer than expected.

I can take a look at this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/12bb3f087d041c9c223b0600befc9777f9e74d40

commit 12bb3f087d041c9c223b0600befc9777f9e74d40
Author: John Abd-El-Malek <jam@chromium.org>
Date: Mon Aug 13 04:35:09 2018

Get LoadStatus working with network service.

Bug:  819663 

Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I5a79280401e460954a53de4db529061c3f9bae49
Reviewed-on: https://chromium-review.googlesource.com/1171257
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582502}
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/content/browser/loader/resource_dispatcher_host_impl.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/content/browser/loader/resource_dispatcher_host_impl.h
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/content/browser/network_service_client.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/content/browser/network_service_client.h
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/content/browser/web_contents/web_contents_impl_browsertest.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/network_context.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/network_service.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/network_service.h
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/network_service_unittest.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/public/mojom/network_service.mojom
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/test/test_network_service_client.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/test/test_network_service_client.h
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/services/network/url_loader_unittest.cc
[modify] https://crrev.com/12bb3f087d041c9c223b0600befc9777f9e74d40/testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter

Worth noting that with the above CL, we'll still not be able to report when a request is blocked by a web request extension (Not even sure what we'll report then - I suppose the network service will not recognize those blocked before start, and those blocked during redirects or at some other phase will just report that they're blocked by something, which is mapped to "Processing request", which isn't too useful)