Speed up ARC boot if the user launches ARC app while ARC is not ready

chromeos/dbus/fake_session_manager_client.h

 // Copyright 2013 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.
 
 #ifndef CHROMEOS_DBUS_FAKE_SESSION_MANAGER_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_SESSION_MANAGER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 49 matching lines @@
       const std::string& policy_blob,
       const StorePolicyCallback& callback) override;
   void SetFlagsForUser(const cryptohome::Identification& cryptohome_id,
                        const std::vector<std::string>& flags) override;
   void GetServerBackedStateKeys(const StateKeysCallback& callback) override;
 
   void CheckArcAvailability(const ArcCallback& callback) override;
   void StartArcInstance(const cryptohome::Identification& cryptohome_id,
                         const ArcCallback& callback) override;
   void StopArcInstance(const ArcCallback& callback) override;
+  void PrioritizeArcInstance(const ArcCallback& callback) override;
   void GetArcStartTime(const GetArcStartTimeCallback& callback) override;
   void RemoveArcData(const cryptohome::Identification& cryptohome_id,
                      const ArcCallback& callback) override;
 
   const std::string& device_policy() const;
   void set_device_policy(const std::string& policy_blob);
 
   const std::string& user_policy(
       const cryptohome::Identification& cryptohome_id) const;
   void set_user_policy(const cryptohome::Identification& cryptohome_id,
@@ skipping 47 matching lines @@
   int notify_lock_screen_dismissed_call_count_;
 
   bool arc_available_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSessionManagerClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_SESSION_MANAGER_CLIENT_H_