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The address of the local proxy is sent via a dbus signal when a local
proxy worker becomes active. The local proxy url is sent to the system
services on Chrome OS via Chrome's proxy resolution service. System
services will connect to the local proxy and the local proxy will setup
the connection through the remote web proxy and perform proxy
authentication on behalf of the CrOS services.

BUG=chromium:1042642
TEST=browser_test ProxyResolutionServiceProviderSystemProxyPolicyTest

Change-Id: I73a1c36bb265cba7e6dce0c59431d010a3f096ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2192655
Commit-Queue: Andreea-Elena Costinas <acostinas@google.com>
Reviewed-by: Andreea-Elena Costinas <acostinas@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Michael Ershov <miersh@google.com>
Reviewed-by: Omar Morsi <omorsi@google.com>
Cr-Commit-Position: refs/heads/master@{#769055}