arc-bridge: Enable ARC with a command-line flag

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 "base/macros.h"
 #include "base/observer_list.h"
 #include "base/sequenced_task_runner.h"
 #include "components/arc/common/arc_message_types.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 
+namespace base {
+class CommandLine;
+}
+
 namespace arc {
 
 // The Chrome-side service that handles ARC instances and ARC bridge creation.
 // This service handles the lifetime of ARC instances and sets up the
 // communication channel (the ARC bridge) used to send and receive messages.
 class ArcBridgeService : public IPC::Listener {
  public:
   // The possible states of the bridge.  In the normal flow, the state changes
   // in the following sequence:
   //
@@ skipping 51 matching lines @@
 
   ArcBridgeService(
       const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner,
       const scoped_refptr<base::SequencedTaskRunner>& file_task_runner);
   ~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.
   void DetectAvailability();
 
   // 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.
   void HandleStartup();
 
@@ skipping 84 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_