QUIC - add new UMA histograms to help understand HPACK head of line blocking.

net/quic/quic_chromium_client_session.h

 // Copyright (c) 2012 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.
 //
 // A client specific QuicSession subclass.  This class owns the underlying
 // QuicConnection and QuicConnectionHelper objects.  The connection stores
 // a non-owning pointer to the helper so this session needs to ensure that
 // the helper outlives the connection.
 
 #ifndef NET_QUIC_QUIC_CHROMIUM_CLIENT_SESSION_H_
@@ skipping 120 matching lines @@
       const QuicConfig& config,
       QuicCryptoClientConfig* crypto_config,
       const char* const connection_description,
       base::TimeTicks dns_resolution_end_time,
       QuicClientPushPromiseIndex* push_promise_index,
       base::TaskRunner* task_runner,
       std::unique_ptr<SocketPerformanceWatcher> socket_performance_watcher,
       NetLog* net_log);
   ~QuicChromiumClientSession() override;
 
+  void Initialize() override;
+
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Attempts to create a new stream.  If the stream can be
   // created immediately, returns OK.  If the open stream limit
   // has been reached, returns ERR_IO_PENDING, and |request|
   // will be added to the stream requets queue and will
   // be completed asynchronously.
   // TODO(rch): remove |stream| from this and use setter on |request|
   // and fix in spdy too.
@@ skipping 200 matching lines @@
   int streams_pushed_count_;
   int streams_pushed_and_claimed_count_;
   base::WeakPtrFactory<QuicChromiumClientSession> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicChromiumClientSession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_CHROMIUM_CLIENT_SESSION_H_