commit e5243e7446e4bae1bdeb43f1d4c526de3bf939f5
author justincarlson <justincarlson@chromium.org> Tue Apr 11 19:58:57 2017
committer Commit bot <commit-bot@chromium.org> Tue Apr 11 19:58:57 2017
tree a8c1063c103f15290405d1366e414ac050b7489a
parent 9fe3bc8107285979782a49dbcf0a37cfe0187696

Make CUPS USB printing play better with the settings page.  This change does several things:

* Provides a real implementation of PrinterDiscoverer, and re-enables
  it.

* Adds support for observers to CupsPrinterDetector,

* Connects PrinterDiscoverer to CupsPrinterDetector, so
  PrinterDiscoverer knows about USB printers

BUGS=616866,706582
BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2790603003
Cr-Commit-Position: refs/heads/master@{#463738}