Resolve initialize/destory order between ArcService and ArcSessionManager.

chrome/browser/chromeos/arc/arc_service_launcher.h

Index: chrome/browser/chromeos/arc/arc_service_launcher.h
diff --git a/chrome/browser/chromeos/arc/arc_service_launcher.h b/chrome/browser/chromeos/arc/arc_service_launcher.h
index 7d912bbb5dc1bfcd7f89bd5841e078a36949af1a..8fef6c1ab26185306e6f05b1c5b424177e1d313e 100644
--- a/chrome/browser/chromeos/arc/arc_service_launcher.h
+++ b/chrome/browser/chromeos/arc/arc_service_launcher.h
@@ -8,21 +8,36 @@
 #include <memory>
 
 #include "base/macros.h"
-#include "components/arc/arc_service_manager.h"
+
+class Profile;
 
 namespace arc {
 
+class ArcServiceManager;
+class ArcSessionManager;
+
 // Detects ARC availability and launches ARC bridge service.
 class ArcServiceLauncher {
  public:
   ArcServiceLauncher();
   ~ArcServiceLauncher();
 
+  // This is to access OnPrimaryUserProfilePrepared() only.
+  static ArcServiceLauncher* Get();
+
+  // Called before the main MessageLooop starts.
   void Initialize();
+
+  // Called after the main MessageLoop stops, but before the Profile is
+  // destroyed.
   void Shutdown();
 
+  // Called when the main profile is initialized after user logs in.
+  void OnPrimaryUserProfilePrepared(Profile* profile);
+
  private:
   std::unique_ptr<ArcServiceManager> arc_service_manager_;
+  std::unique_ptr<ArcSessionManager> arc_session_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcServiceLauncher);
 };