Refactor ArcBridgeService detection and initialization to a separate class ArcServiceLauncher.

components/arc/arc_bridge_service.h

 // 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.
 
 #ifndef COMPONENTS_ARC_ARC_BRIDGE_SERVICE_H_
 #define COMPONENTS_ARC_ARC_BRIDGE_SERVICE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 113 matching lines @@
   ~ArcBridgeService() override;
 
   // Gets the global instance of the ARC Bridge Service. This can only be
   // called on the thread that this class was created on.
   static ArcBridgeService* Get();
 
   // Return true if ARC has been enabled through a commandline
   // switch.
   static bool GetEnabled(const base::CommandLine* command_line);
 
-  // DetectAvailability() should be called once D-Bus is available. It will
-  // call CheckArcAvailability() on the session_manager. This can only be
-  // called on the thread that this class was created on.
-  virtual void DetectAvailability() = 0;
+  // SetDetectionResult() should be called once CheckArcAvailability() on the
+  // session_manager is called. This can only be called on the thread that this
+  // class was created on.
+  virtual void SetDetectionResult(bool availability) = 0;

[xiyuan, 2016/02/26 17:38:01]

nit: SetDetectionResult -> SetDetectedAvailability

[arthurhsu, 2016/02/26 19:10:06]

Done

 
   // HandleStartup() should be called upon profile startup.  This will only
   // launch an instance if the instance service is available and it is enabled.
   // This can only be called on the thread that this class was created on.
   virtual void HandleStartup() = 0;
 
   // Shutdown() should be called when the browser is shutting down. This can
   // only be called on the thread that this class was created on.
   virtual void Shutdown() = 0;
 
@@ skipping 147 matching lines @@
 
   // WeakPtrFactory to use callbacks.
   base::WeakPtrFactory<ArcBridgeService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcBridgeService);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_BRIDGE_SERVICE_H_