Add ArcEnabled policy implementation

chrome/browser/chromeos/arc/arc_auth_service.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 "chrome/browser/chromeos/arc/arc_auth_service.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
@@ skipping 206 matching lines @@
   // Reuse storage used in ARC OptIn platform app.
   const std::string site_url =
       base::StringPrintf("%s://%s/persist?%s", content::kGuestScheme,
                          kArcSupportExtensionId, kArcSupportStorageId);
   storage_partition_ = content::BrowserContext::GetStoragePartitionForSite(
       profile_, GURL(site_url));
   CHECK(storage_partition_);
 
   // In case UI is disabled we assume that ARC is opted-in.
   if (!IsOptInVerificationDisabled()) {
+    pref_change_registrar_.Init(profile_->GetPrefs());
+    pref_change_registrar_.Add(
+        prefs::kArcEnabled,
+        base::Bind(&ArcAuthService::OnOptInPreferenceChanged,

[bartfab (slow), 2016/04/04 11:57:03]

Nit: #include "base/bind.h"

[Polina Bondarenko, 2016/04/04 12:03:21]

Done.

+                   base::Unretained(this)));

[bartfab (slow), 2016/04/04 11:57:03]

Nit: #include "base/bind_helpers.h"

[Polina Bondarenko, 2016/04/04 12:03:21]

Done.

     if (profile_->GetPrefs()->GetBoolean(prefs::kArcEnabled)) {
       OnOptInPreferenceChanged();
     } else {
       UpdateEnabledStateUMA(false);
       if (!disable_ui_for_testing && profile_->IsNewProfile()) {
         PrefServiceSyncableFromProfile(profile_)->AddObserver(this);
         OnIsSyncingChanged();
       }
     }
   } else {
@@ skipping 14 matching lines @@
 }
 
 void ArcAuthService::Shutdown() {
   ShutdownBridgeAndCloseUI();
   if (profile_) {
     syncable_prefs::PrefServiceSyncable* pref_service_syncable =
         PrefServiceSyncableFromProfile(profile_);
     pref_service_syncable->RemoveObserver(this);
     pref_service_syncable->RemoveSyncedPrefObserver(prefs::kArcEnabled, this);
   }
+  pref_change_registrar_.RemoveAll();
   profile_ = nullptr;
 }
 
 void ArcAuthService::ShowUI(UIPage page, const base::string16& status) {
   if (disable_ui_for_testing || IsOptInVerificationDisabled())
     return;
 
   SetUIPage(page, status);
   const extensions::AppWindowRegistry* const app_window_registry =
       extensions::AppWindowRegistry::Get(profile_);
@@ skipping 43 matching lines @@
 void ArcAuthService::OnSyncedPrefChanged(const std::string& path,
                                          bool from_sync) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   // Update UMA only for local changes
   if (!from_sync) {
     UpdateOptInActionUMA(profile_->GetPrefs()->GetBoolean(prefs::kArcEnabled)
                              ? OptInActionType::OPTED_IN
                              : OptInActionType::OPTED_OUT);
   }
-
-  OnOptInPreferenceChanged();
 }
 
 void ArcAuthService::OnOptInPreferenceChanged() {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(profile_);
 
   if (profile_->GetPrefs()->GetBoolean(prefs::kArcEnabled)) {
     if (state_ != State::ACTIVE) {
       CloseUI();
       auth_code_.clear();
@@ skipping 190 matching lines @@
       return os << kStateFetchingCode;
     case ArcAuthService::State::ACTIVE:
       return os << kStateActive;
     default:
       NOTREACHED();
       return os;
   }
 }
 
 }  // namespace arc