arc-bridge: Restart ARC instance on crash

components/arc/arc_bridge_bootstrap.cc

 // 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.
 
 #include "components/arc/arc_bridge_bootstrap.h"
 
 #include <fcntl.h>
 
 #include <utility>
 
@@ skipping 39 matching lines @@
   // READY
   //
   // When Stop() is called from any state, either because an operation
   // resulted in an error or because the user is logging out:
   //
   // (any)
   //   Stop() ->
   // STOPPING
   //   StopInstance() ->
   // STOPPED
+  //
+  // When the instance crashes while it was ready, it will be stopped:
+  //   READY -> STOPPING -> STOPPED
+  // and then restarted:
+  //   STOPPED -> SOCKET_CREATING -> ... -> READY).
   enum class State {
     // ARC is not currently running.
     STOPPED,
 
     // An UNIX socket is being created.
     SOCKET_CREATING,
 
     // The request to start the instance has been sent.
     STARTING,
 
@@ skipping 210 matching lines @@
 
 ArcBridgeBootstrap::ArcBridgeBootstrap() {}
 ArcBridgeBootstrap::~ArcBridgeBootstrap() {}
 
 // static
 scoped_ptr<ArcBridgeBootstrap> ArcBridgeBootstrap::Create() {
   return make_scoped_ptr(new ArcBridgeBootstrapImpl());
 }
 
 }  // namespace arc