[Draft] Fix canceling pin prompt causes host overload

remoting/protocol/third_party_authenticator_base.cc

Index: remoting/protocol/third_party_authenticator_base.cc
diff --git a/remoting/protocol/third_party_authenticator_base.cc b/remoting/protocol/third_party_authenticator_base.cc
index 9d6be72db2eabdb2d0c032bba867e9ea8c556ebc..019e7889c17ee79e63b2eb91f7d1504a43c55046 100644
--- a/remoting/protocol/third_party_authenticator_base.cc
+++ b/remoting/protocol/third_party_authenticator_base.cc
@@ -28,12 +28,17 @@ const buzz::StaticQName ThirdPartyAuthenticatorBase::kTokenTag =
 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();
@@ -74,9 +79,10 @@ scoped_ptr<buzz::XmlElement> ThirdPartyAuthenticatorBase::GetNextMessage() {
     message = CreateEmptyAuthenticatorMessage();
   }
 
-  if (token_state_ == MESSAGE_READY)
+  if (token_state_ == MESSAGE_READY) {
     AddTokenElements(message.get());
-
+    started_ = true;
+  }
   return message.Pass();
 }