[net/auth] Add a lifetime NetLog event to HttpAuthController.

The NetLogEventType::AUTH_CONTROLLER BEGIN event is logged the first
time an entry point method is invoked on the controller. The END event
is logged upon the destruction of the controller if a BEGIN event was
logged.

R: mmenke@chromium.org
Bug: 884313
Change-Id: I884fc21f8208e60d5306bb9ea412b982aa90d2da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1619828
Commit-Queue: Asanka Herath <asanka@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Auto-Submit: Asanka Herath <asanka@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662054}
2 files changed