Hold cros_component_installers in browser_process.

chrome/browser/browser_process_platform_part_chromeos.h

 // Copyright (c) 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 CHROME_BROWSER_BROWSER_PROCESS_PLATFORM_PART_CHROMEOS_H_
 #define CHROME_BROWSER_BROWSER_PROCESS_PLATFORM_PART_CHROMEOS_H_
 
 #include <memory>
+#include <string>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/browser_process_platform_part_base.h"
 
 namespace chromeos {
 class ChromeSessionManager;
 class ChromeUserManager;
 class ProfileHelper;
@@ skipping 72 matching lines @@
 
   // Overridden from BrowserProcessPlatformPartBase:
   void StartTearDown() override;
 
   std::unique_ptr<policy::BrowserPolicyConnector> CreateBrowserPolicyConnector()
       override;
 
   chromeos::system::SystemClock* GetSystemClock();
   void DestroySystemClock();
 
+  void AddCompatibleCrOSComponent(const std::string& name);
+
+  bool IsCompatibleCrOSComponent(const std::string& name);
+
  private:
   void CreateProfileHelper();
 
   std::unique_ptr<chromeos::ChromeSessionManager> session_manager_;
 
   bool created_profile_helper_;
   std::unique_ptr<chromeos::ProfileHelper> profile_helper_;
 
   std::unique_ptr<chromeos::system::AutomaticRebootManager>
       automatic_reboot_manager_;
 
   std::unique_ptr<chromeos::ChromeUserManager> chrome_user_manager_;
 
   std::unique_ptr<chromeos::system::DeviceDisablingManagerDefaultDelegate>
       device_disabling_manager_delegate_;
   std::unique_ptr<chromeos::system::DeviceDisablingManager>
       device_disabling_manager_;
 
   std::unique_ptr<chromeos::system::TimeZoneResolverManager>
       timezone_resolver_manager_;
   std::unique_ptr<chromeos::TimeZoneResolver> timezone_resolver_;
 
   std::unique_ptr<chromeos::system::SystemClock> system_clock_;
 
   std::unique_ptr<ScopedKeepAlive> keep_alive_;
 
+  std::vector<std::string> compatible_cros_components_;

[sky, 2017/05/25 02:25:50]

Given your usage, wouldn't a std::set be a better fit? And possibly a flat_set
if the size is small?

[xiaochu, 2017/05/25 02:40:45]

Done.

Yeah, max size is number of cros components (currently only one). Thanks for
pointing this out.

+
   DISALLOW_COPY_AND_ASSIGN(BrowserProcessPlatformPart);
 };
 
 #endif  // CHROME_BROWSER_BROWSER_PROCESS_PLATFORM_PART_CHROMEOS_H_