Add a new QuicFlagSaver class for saving/restoring the values of QUIC flags in tests.

net/quic/core/quic_session_test.cc

 // 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.
 
 #include "net/quic/core/quic_session.h"
 
 #include <set>
 #include <utility>
 
 #include "base/rand_util.h"
@@ skipping 248 matching lines @@
   }
 
   void CloseStream(QuicStreamId id) {
     EXPECT_CALL(*connection_, SendRstStream(id, _, _));
     session_.CloseStream(id);
     closed_streams_.insert(id);
   }
 
   QuicVersion version() const { return connection_->version(); }
 
+  QuicFlagSaver flags_;  // Save/restore all QUIC flag values.
   MockQuicConnectionHelper helper_;
   MockAlarmFactory alarm_factory_;
   StrictMock<MockQuicConnection>* connection_;
   TestSession session_;
   set<QuicStreamId> closed_streams_;
   SpdyHeaderBlock headers_;
 };
 
 class QuicSessionTestServer : public QuicSessionTestBase {
  protected:
@@ skipping 973 matching lines @@
   if (version() <= QUIC_VERSION_35) {
     EXPECT_FALSE(session_.force_hol_blocking());
   } else {
     EXPECT_TRUE(session_.force_hol_blocking());
   }
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net