[Draft] Fix canceling pin prompt causes host overload

remoting/protocol/third_party_authenticator_base.cc

 // 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.
 
 #include "remoting/protocol/third_party_authenticator_base.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
@@ skipping 10 matching lines @@
 const buzz::StaticQName ThirdPartyAuthenticatorBase::kTokenUrlTag =
     { remoting::kChromotingXmlNamespace, "third-party-token-url" };
 const buzz::StaticQName ThirdPartyAuthenticatorBase::kTokenScopeTag =
     { remoting::kChromotingXmlNamespace, "third-party-token-scope" };
 const buzz::StaticQName ThirdPartyAuthenticatorBase::kTokenTag =
     { remoting::kChromotingXmlNamespace, "third-party-token" };
 
 ThirdPartyAuthenticatorBase::ThirdPartyAuthenticatorBase(
     Authenticator::State initial_state)
     : token_state_(initial_state),
+      started_(false),
       rejection_reason_(INVALID_CREDENTIALS) {
 }
 
 ThirdPartyAuthenticatorBase::~ThirdPartyAuthenticatorBase() {
 }
 
+bool ThirdPartyAuthenticatorBase::started() const {
+  return started_;
+}
+
 Authenticator::State ThirdPartyAuthenticatorBase::state() const {
   if (token_state_ == ACCEPTED)
     return underlying_->state();
   return token_state_;
 }
 
 Authenticator::RejectionReason
 ThirdPartyAuthenticatorBase::rejection_reason() const {
   DCHECK_EQ(state(), REJECTED);
 
@@ skipping 20 matching lines @@
 scoped_ptr<buzz::XmlElement> ThirdPartyAuthenticatorBase::GetNextMessage() {
   DCHECK_EQ(state(), MESSAGE_READY);
 
   scoped_ptr<buzz::XmlElement> message;
   if (underlying_ && underlying_->state() == MESSAGE_READY) {
     message = underlying_->GetNextMessage().Pass();
   } else {
     message = CreateEmptyAuthenticatorMessage();
   }
 
-  if (token_state_ == MESSAGE_READY)
+  if (token_state_ == MESSAGE_READY) {
     AddTokenElements(message.get());
-
+    started_ = true;
+  }
   return message.Pass();
 }
 
 scoped_ptr<ChannelAuthenticator>
 ThirdPartyAuthenticatorBase::CreateChannelAuthenticator() const {
   DCHECK_EQ(state(), ACCEPTED);
 
   return underlying_->CreateChannelAuthenticator();
 }
 
 }  // namespace protocol
 }  // namespace remoting