[Cast Channel] Add support for nonce challenge to Cast channel authentication.

extensions/browser/api/cast_channel/cast_socket.cc

Index: extensions/browser/api/cast_channel/cast_socket.cc
diff --git a/extensions/browser/api/cast_channel/cast_socket.cc b/extensions/browser/api/cast_channel/cast_socket.cc
index 3bb675cf3fd9f74b4424d13044a8cf14ba0d7d99..cf320874f655026146a79138b7f0b874b7a5665c 100644
--- a/extensions/browser/api/cast_channel/cast_socket.cc
+++ b/extensions/browser/api/cast_channel/cast_socket.cc
@@ -113,7 +113,8 @@ CastSocketImpl::CastSocketImpl(const std::string& owner_extension_id,
                                const base::TimeDelta& timeout,
                                bool keep_alive,
                                const scoped_refptr<Logger>& logger,
-                               uint64_t device_capabilities)
+                               uint64_t device_capabilities,
+                               const std::string& nonce)
     : CastSocket(owner_extension_id),
       owner_extension_id_(owner_extension_id),
       channel_id_(0),
@@ -130,7 +131,8 @@ CastSocketImpl::CastSocketImpl(const std::string& owner_extension_id,
       connect_state_(proto::CONN_STATE_START_CONNECT),
       error_state_(CHANNEL_ERROR_NONE),
       ready_state_(READY_STATE_NONE),
-      auth_delegate_(nullptr) {
+      auth_delegate_(nullptr),
+      nonce_(nonce) {
   DCHECK(net_log_);
   net_log_source_.type = net::NetLogSourceType::SOCKET;
   net_log_source_.id = net_log_->NextID();
@@ -235,7 +237,7 @@ bool CastSocketImpl::VerifyChannelPolicy(const AuthResult& result) {
 bool CastSocketImpl::VerifyChallengeReply() {
   DCHECK(peer_cert_);
   AuthResult result =
-      AuthenticateChallengeReply(*challenge_reply_, *peer_cert_);
+      AuthenticateChallengeReply(*challenge_reply_, *peer_cert_, nonce_);
   logger_->LogSocketChallengeReplyEvent(channel_id_, result);
   if (result.success()) {
     VLOG(1) << result.error_message;
@@ -450,7 +452,7 @@ int CastSocketImpl::DoAuthChallengeSend() {
   SetConnectState(proto::CONN_STATE_AUTH_CHALLENGE_SEND_COMPLETE);
 
   CastMessage challenge_message;
-  CreateAuthChallengeMessage(&challenge_message);
+  CreateAuthChallengeMessage(&challenge_message, nonce_);
   VLOG_WITH_CONNECTION(1) << "Sending challenge: "
                           << CastMessageToString(challenge_message);