Extract ArcSupportMessageHost.

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 "ash/common/shelf/shelf_delegate.h"
 #include "ash/common/wm_shell.h"
@@ skipping 466 matching lines @@
   if (!IsAllowedForProfile(profile))
     return;
 
   // TODO(khmel): Move this to IsAllowedForProfile.
   if (IsArcDisabledForEnterprise() && IsAccountManaged(profile)) {
     VLOG(2) << "Enterprise users are not supported in ARC.";
     return;
   }
 
   profile_ = profile;
+  // Create the support host at initialization. Note that, practically,
+  // ARC support Chrome app is rarely used (only opt-in and re-auth flow).
+  // So, it may be better to initialize it lazily.
+  // TODO(hidehiko): Revisit to think about lazy initialization.
+  support_host_.reset(new ArcSupportHost());
   SetState(State::STOPPED);
 
   PrefServiceSyncableFromProfile(profile_)->AddSyncedPrefObserver(
       prefs::kArcEnabled, this);
 
   context_.reset(new ArcAuthContext(this, profile_));
 
   // In case UI is disabled we assume that ARC is opted-in.
   if (IsOptInVerificationDisabled()) {
     auth_code_.clear();
@@ skipping 61 matching lines @@
   if (app_window_registry->GetCurrentAppWindowForApp(
           ArcSupportHost::kHostAppId)) {
     return;
   }
 
   const extensions::Extension* extension =
       extensions::ExtensionRegistry::Get(profile_)->GetInstalledExtension(
           ArcSupportHost::kHostAppId);
   CHECK(extension && extensions::util::IsAppLaunchable(
                          ArcSupportHost::kHostAppId, profile_));
-
   OpenApplication(CreateAppLaunchParamsUserContainer(
       profile_, extension, WindowOpenDisposition::NEW_WINDOW,
       extensions::SOURCE_CHROME_INTERNAL));
 }
 
 void ArcAuthService::OnContextReady() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   DCHECK(!initial_opt_in_);
   CheckAndroidManagement(false);
@@ skipping 96 matching lines @@
 }
 
 void ArcAuthService::RemoveObserver(Observer* observer) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   observer_list_.RemoveObserver(observer);
 }
 
 void ArcAuthService::CloseUI() {
   ui_page_ = UIPage::NO_PAGE;
   ui_page_status_.clear();
-  for (auto& observer : observer_list_)
-    observer.OnOptInUIClose();
+  if (support_host_)
+    support_host_->Close();
   if (!g_disable_ui_for_testing)
     ArcAuthNotification::Hide();
 }
 
 void ArcAuthService::SetUIPage(UIPage page, const base::string16& status) {
   ui_page_ = page;
   ui_page_status_ = status;
-  for (auto& observer : observer_list_)
-    observer.OnOptInUIShowPage(ui_page_, ui_page_status_);
+  if (support_host_)
+    support_host_->ShowPage(ui_page_, ui_page_status_);
 }
 
 // This is the special method to support enterprise mojo API.
 // TODO(hidehiko): Remove this.
 void ArcAuthService::StopAndEnableArc() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   DCHECK(!arc_bridge_service()->stopped());
   reenable_arc_ = true;
   StopArc();
 }
@@ skipping 263 matching lines @@
       return os << kStateFetchingCode;
     case ArcAuthService::State::ACTIVE:
       return os << kStateActive;
     default:
       NOTREACHED();
       return os;
   }
 }
 
 }  // namespace arc