arc-bridge: Start ArcBridgeService on session start

components/arc/arc_prefs.cc

+// Copyright 2015 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 "components/arc/arc_prefs.h"
+
+#include "base/command_line.h"
+#include "base/prefs/pref_registry_simple.h"
+#include "base/prefs/pref_service.h"
+#include "chromeos/chromeos_switches.h"
+#include "components/arc/arc_pref_names.h"
+
+namespace arc {
+
+// static
+void ArcPrefs::RegisterProfilePrefs(PrefRegistrySimple* registry) {
+  DCHECK(registry);
+  registry->RegisterBooleanPref(arc::prefs::kArcEnabled, false);
+}
+
+// static
+bool ArcPrefs::GetEnabled(const PrefService* prefs,
+                          const base::CommandLine* command_line) {
+  return command_line->HasSwitch(chromeos::switches::kEnableArc) ||
+         (prefs && prefs->GetBoolean(arc::prefs::kArcEnabled));
+}
+
+// static
+void ArcPrefs::SetEnabled(PrefService* prefs, bool enabled) {
+  DCHECK(prefs);
+  prefs->SetBoolean(arc::prefs::kArcEnabled, enabled);
+}
+
+}  // namespace arc