Enables delegating signal strategy for It2Me Host.

remoting/signaling/xmpp_signal_strategy.h

 // Copyright 2014 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 REMOTING_SIGNALING_XMPP_SIGNAL_STRATEGY_H_
 #define REMOTING_SIGNALING_XMPP_SIGNAL_STRATEGY_H_
 
 #include "remoting/signaling/signal_strategy.h"
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 
 namespace net {
 class ClientSocketFactory;
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace remoting {
 
 // XmppSignalStrategy implements SignalStrategy using direct XMPP connection.
+// This class can be created on a different thread from the one it is used (when
+// Connect() is called).
 class XmppSignalStrategy : public SignalStrategy {
  public:
   // XMPP Server configuration for XmppSignalStrategy.
   struct XmppServerConfig {
     XmppServerConfig();
     XmppServerConfig(const XmppServerConfig& other);
     ~XmppServerConfig();
 
     std::string host;
     int port;
@@ skipping 20 matching lines @@
   bool SendStanza(std::unique_ptr<buzz::XmlElement> stanza) override;
   std::string GetNextId() override;
 
   // This method is used to update the auth info (for example when the OAuth
   // access token is renewed). It is OK to call this even when we are in the
   // CONNECTED state. It will be used on the next Connect() call.
   void SetAuthInfo(const std::string& username,
                    const std::string& auth_token);
 
  private:
+  // This ensures that even if a Listener deletes the current instance during
+  // OnSignalStrategyIncomingStanza(), we can delete |core_| asynchronously.
   class Core;
 
   std::unique_ptr<Core> core_;
 
   DISALLOW_COPY_AND_ASSIGN(XmppSignalStrategy);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_SIGNALING_XMPP_SIGNAL_STRATEGY_H_