arc: Notify ARC instance failures via callbacks.

components/arc/arc_bridge_bootstrap.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_BOOTSTRAP_H_
 #define COMPONENTS_ARC_ARC_BRIDGE_BOOTSTRAP_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/sequenced_task_runner.h"
 #include "base/single_thread_task_runner.h"
+#include "components/arc/arc_bridge_service.h"
 #include "components/arc/common/arc_bridge.mojom.h"
 
 namespace arc {
 
 // Starts the ARC instance and bootstraps the bridge connection.
 // Clients should implement the Delegate to be notified upon communications
 // being available.
 class ArcBridgeBootstrap {
  public:
+  using StopReason = ArcBridgeService::StopReason;
+
   class Delegate {
    public:
+    // Called when the connection with ARC instance has been established.
     virtual void OnConnectionEstablished(
         mojom::ArcBridgeInstancePtr instance_ptr) = 0;
-    virtual void OnStopped() = 0;
+
+    // Called when ARC instance is stopped.
+    virtual void OnStopped(StopReason reason) = 0;
   };
 
   // Creates a default instance of ArcBridgeBootstrap.
   static std::unique_ptr<ArcBridgeBootstrap> Create();
   virtual ~ArcBridgeBootstrap() = default;
 
   // This must be called before calling Start() or Stop(). |delegate| is owned
   // by the caller and must outlive this instance.
   void set_delegate(Delegate* delegate) { delegate_ = delegate; }
 
@@ skipping 11 matching lines @@
   // Owned by the caller.
   Delegate* delegate_ = nullptr;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ArcBridgeBootstrap);
 };
 
 }  // namespace arc
 
 #endif  // COMPONENTS_ARC_ARC_BRIDGE_BOOTSTRAP_H_