arc: Add Arc Kiosk app service and ability to launch kiosk apps.

chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_manager.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 <chrome/browser/chromeos/app_mode/arc/arc_kiosk_app_manager.h>
 
 #include <algorithm>
 #include <utility>
 
 #include "base/barrier_closure.h"
@@ skipping 135 matching lines @@
   local_accounts_subscription_.reset();
   local_account_auto_login_id_subscription_.reset();
   apps_.clear();
   g_arc_kiosk_app_manager = nullptr;
 }
 
 const AccountId& ArcKioskAppManager::GetAutoLaunchAccountId() const {
   return auto_launch_account_id_;
 }
 
+const ArcKioskAppManager::ArcKioskApp* ArcKioskAppManager::GetAppByAccountId(
+    const AccountId& account_id) {
+  for (auto& app : GetAllApps())
+    if (app.account_id() == account_id)
+      return &app;
+  return nullptr;
+}
+
 void ArcKioskAppManager::AddObserver(ArcKioskAppManagerObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void ArcKioskAppManager::RemoveObserver(ArcKioskAppManagerObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void ArcKioskAppManager::UpdateApps() {
   // Store current apps. We will compare old and new apps to determine which
@@ skipping 65 matching lines @@
           cryptohome_id, base::Bind(&OnRemoveAppCryptohomeComplete,
                                     cryptohome_id, base::Closure()));
     }
   }
 
   if (active_user_to_be_deleted)
     chrome::AttemptUserExit();
 }
 
 }  // namespace chromeos