[Draft] Fix canceling pin prompt causes host overload

remoting/protocol/third_party_authenticator_base.h

 // Copyright 2013 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_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
 #define REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 18 matching lines @@
 // host. The host signs the token, then contacts the third-party server to
 // exchange the token for the shared secret. Once both client and host have the
 // shared secret, they use an underlying |V2Authenticator| (SPAKE2) to negotiate
 // an authentication key, which is used to establish the connection.
 class ThirdPartyAuthenticatorBase : public Authenticator {
  public:
   virtual ~ThirdPartyAuthenticatorBase();
 
   // Authenticator interface.
   virtual State state() const OVERRIDE;
+  virtual bool started() const OVERRIDE;
   virtual RejectionReason rejection_reason() const OVERRIDE;
   virtual void ProcessMessage(const buzz::XmlElement* message,
                               const base::Closure& resume_callback) OVERRIDE;
   virtual scoped_ptr<buzz::XmlElement> GetNextMessage() OVERRIDE;
   virtual scoped_ptr<ChannelAuthenticator>
       CreateChannelAuthenticator() const OVERRIDE;
 
  protected:
   // XML tag names for third party authentication fields.
   static const buzz::StaticQName kTokenUrlTag;
@@ skipping 10 matching lines @@
   // Processes the token-related elements of the message.
   virtual void ProcessTokenMessage(
       const buzz::XmlElement* message,
       const base::Closure& resume_callback) = 0;
 
   // Adds the token related XML elements to the message.
   virtual void AddTokenElements(buzz::XmlElement* message) = 0;
 
   scoped_ptr<Authenticator> underlying_;
   State token_state_;
+  bool started_;
   RejectionReason rejection_reason_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ThirdPartyAuthenticatorBase);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_THIRD_PARTY_AUTHENTICATOR_BASE_H_