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DDoc: go/cups-plugin

The service should lazily start once it knows the daemon has started;
this CL adds a WaitForServiceToBeAvailable method to the CupsProxyClient
for that purpose.

This CL also adds the CupsProxyServiceManager, which is started with the
browser, waits for daemon startup, then starts the service by
connecting to it.
Note: the service maintains its own lifetime and connection with the
daemon; this manager simply starts it.

Bug: chromium:945409
Test: TBD
Change-Id: Idf08a1153493c8e7abfcd5ad291203ea12a692b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1586540Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664577}