To mitigate the effects of hanging 0-RTT QUIC connections,

net/quic/quic_client_session.h

Index: net/quic/quic_client_session.h
diff --git a/net/quic/quic_client_session.h b/net/quic/quic_client_session.h
index ca4d7b810468c947a26e7c0fb8e86089e33137e9..f12003e576d8041d84c26cf6be6330b541f0c7f1 100644
--- a/net/quic/quic_client_session.h
+++ b/net/quic/quic_client_session.h
@@ -99,6 +99,7 @@ class NET_EXPORT_PRIVATE QuicClientSession : public QuicClientSessionBase {
                     const QuicConfig& config,
                     uint32 max_flow_control_receive_window_bytes,
                     QuicCryptoClientConfig* crypto_config,
+                    base::TaskRunner* task_runner,
                     NetLog* net_log);
 
   virtual ~QuicClientSession();
@@ -150,6 +151,9 @@ class NET_EXPORT_PRIVATE QuicClientSession : public QuicClientSessionBase {
   int CryptoConnect(bool require_confirmation,
                     const CompletionCallback& callback);
 
+  // Resumes a crypto handshake with the server after a timeout.
+  int ResumeCryptoConnect(const CompletionCallback& callback);
+
   // Causes the QuicConnectionHelper to start reading from the socket
   // and passing the data along to the QuicConnection.
   void StartReading();
@@ -214,6 +218,8 @@ class NET_EXPORT_PRIVATE QuicClientSession : public QuicClientSessionBase {
   // delete |this|.
   void NotifyFactoryOfSessionClosed();
 
+  void OnConnectTimeout();
+
   bool require_confirmation_;
   scoped_ptr<QuicCryptoClientStream> crypto_stream_;
   QuicStreamFactory* stream_factory_;
@@ -227,6 +233,7 @@ class NET_EXPORT_PRIVATE QuicClientSession : public QuicClientSessionBase {
   bool read_pending_;
   CompletionCallback callback_;
   size_t num_total_streams_;
+  base::TaskRunner* task_runner_;
   BoundNetLog net_log_;
   QuicConnectionLogger logger_;
   // Number of packets read in the current read loop.