Track printer installations for each configuration.

chromeos/printing/printer_configuration.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/printing/printer_configuration.h"
 
 #include <string>
 
 #include "base/guid.h"
 
 namespace chromeos {
 
 Printer::Printer() : source_(SRC_USER_PREFS) {
   id_ = base::GenerateGUID();
 }
 
-Printer::Printer(const std::string& id) : id_(id), source_(SRC_USER_PREFS) {
+Printer::Printer(const std::string& id, const base::Time& last_updated)
+    : id_(id), source_(SRC_USER_PREFS), last_updated_(last_updated) {
   if (id_.empty())
     id_ = base::GenerateGUID();
 }
 
 Printer::Printer(const Printer& other) = default;
 
 Printer& Printer::operator=(const Printer& other) = default;
 
 Printer::~Printer() {}
 
 bool Printer::IsIppEverywhere() const {
   // TODO(skau): Add check for IPP Everywhere value.
   return false;
 }
 
 }  // namespace chromeos