Migrate ArcBridgeService::Observer and ArcSession::Observer.

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 <iosfwd>
 #include <string>
 #include <vector>
 
 #include "base/files/scoped_file.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/values.h"
+#include "components/arc/arc_session_observer.h"
 #include "components/arc/instance_holder.h"
 
 namespace base {
 class CommandLine;
 }  // namespace base
 
 namespace arc {
 
 class ArcBridgeTest;
 
@@ skipping 26 matching lines @@
 class VideoInstance;
 class WallpaperInstance;
 
 }  // namespace mojom
 
 // 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:
-  // Describes the reason the bridge is stopped.
-  enum class StopReason {
-    // ARC instance has been gracefully shut down.
-    SHUTDOWN,
-
-    // Errors occurred during the ARC instance boot. This includes any failures
-    // before the instance is actually attempted to be started, and also
-    // failures on bootstrapping IPC channels with Android.
-    GENERIC_BOOT_FAILURE,
-
-    // The device is critically low on disk space.
-    LOW_DISK_SPACE,
-
-    // ARC instance has crashed.
-    CRASH,
-  };
-
-  // Notifies life cycle events of ArcBridgeService.
-  class Observer {
-   public:
-    // Called whenever the state of the bridge has changed.
-    virtual void OnBridgeReady() {}
-    virtual void OnBridgeStopped(StopReason reason) {}
-
-   protected:
-    virtual ~Observer() {}
-  };
-
   ArcBridgeService();
   virtual ~ArcBridgeService();
 
   // Return true if ARC has been enabled through a commandline
   // switch.
   static bool GetEnabled(const base::CommandLine* command_line);
 
   // Return true if ARC is available on the current board.
   static bool GetAvailable(const base::CommandLine* command_line);
 
   // HandleStartup() should be called upon profile startup.  This will only
   // launch an instance if the instance is enabled.
   // This can only be called on the thread that this class was created on.
 
   // Starts the ARC service, then it will connect the Mojo channel. When the
   // bridge becomes ready, OnBridgeReady() is called.
   virtual void RequestStart();
 
   // Stops the ARC service.
   virtual void RequestStop();
 
   // OnShutdown() should be called when the browser is shutting down. This can
   // only be called on the thread that this class was created on. We assume that
   // when this function is called, MessageLoop is no longer exists.
   virtual void OnShutdown();
 
   // Adds or removes observers. This can only be called on the thread that this
   // class was created on. RemoveObserver does nothing if |observer| is not in
   // the list.
-  void AddObserver(Observer* observer);
-  void RemoveObserver(Observer* observer);
+  void AddObserver(ArcSessionObserver* observer);
+  void RemoveObserver(ArcSessionObserver* observer);
 
   InstanceHolder<mojom::AppInstance>* app() { return &app_; }
   InstanceHolder<mojom::AudioInstance>* audio() { return &audio_; }
   InstanceHolder<mojom::AuthInstance>* auth() { return &auth_; }
   InstanceHolder<mojom::BluetoothInstance>* bluetooth() { return &bluetooth_; }
   InstanceHolder<mojom::BootPhaseMonitorInstance>* boot_phase_monitor() {
     return &boot_phase_monitor_;
   }
   InstanceHolder<mojom::ClipboardInstance>* clipboard() { return &clipboard_; }
   InstanceHolder<mojom::CrashCollectorInstance>* crash_collector() {
@@ skipping 100 matching lines @@
 
   // Gets the current state of the bridge service.
   State state() const { return state_; }
 
   // Changes the current state and notifies all observers.
   void SetState(State state);
 
   // Sets the reason the bridge is stopped. This function must be always called
   // before SetState(State::STOPPED) to report a correct reason with
   // Observer::OnBridgeStopped().
-  void SetStopReason(StopReason stop_reason);
+  void SetStopReason(ArcSessionObserver::StopReason stop_reason);
 
-  base::ObserverList<Observer>& observer_list() { return observer_list_; }
+  base::ObserverList<ArcSessionObserver>& observer_list() {
+    return observer_list_;
+  }
 
   bool CalledOnValidThread();
 
  private:
   friend class ArcBridgeTest;
   FRIEND_TEST_ALL_PREFIXES(ArcBridgeTest, Basic);
   FRIEND_TEST_ALL_PREFIXES(ArcBridgeTest, Prerequisites);
   FRIEND_TEST_ALL_PREFIXES(ArcBridgeTest, StopMidStartup);
   FRIEND_TEST_ALL_PREFIXES(ArcBridgeTest, Restart);
   FRIEND_TEST_ALL_PREFIXES(ArcBridgeTest, OnBridgeStopped);
   FRIEND_TEST_ALL_PREFIXES(ArcBridgeTest, Shutdown);
 
-  base::ObserverList<Observer> observer_list_;
+  base::ObserverList<ArcSessionObserver> observer_list_;
 
   base::ThreadChecker thread_checker_;
 
   // The current state of the bridge.
   ArcBridgeService::State state_;
 
   // The reason the bridge is stopped.
-  StopReason stop_reason_;
+  ArcSessionObserver::StopReason stop_reason_;
 
   // WeakPtrFactory to use callbacks.
   base::WeakPtrFactory<ArcBridgeService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcBridgeService);
 };
 
-// Defines "<<" operator for LOGging purpose.
-std::ostream& operator<<(
-    std::ostream& os, ArcBridgeService::StopReason reason);
-
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_BRIDGE_SERVICE_H_