QUIC enable server push by default. Guarded by FLAGS_quic_enable_server_push_by_default.

net/quic/core/quic_spdy_session.h

 // Copyright (c) 2015 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.
 
 #ifndef NET_QUIC_QUIC_SPDY_SESSION_H_
 #define NET_QUIC_QUIC_SPDY_SESSION_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 91 matching lines @@
   void OnConfigNegotiated() override;
 
   // Called by |headers_stream_| when |force_hol_blocking_| is true.
   virtual void OnStreamFrameData(QuicStreamId stream_id,
                                  const char* data,
                                  size_t len,
                                  bool fin);
 
   bool force_hol_blocking() const { return force_hol_blocking_; }
 
+  bool server_push_enabled() const { return server_push_enabled_; }
+
+  // Called by |QuicHeadersStream::UpdateEnableServerPush()| with
+  // value from SETTINGS_ENABLE_PUSH.
+  void set_server_push_enabled(bool enable) { server_push_enabled_ = enable; }
+
  protected:
   // Override CreateIncomingDynamicStream() and CreateOutgoingDynamicStream()
   // with QuicSpdyStream return type to make sure that all data streams are
   // QuicSpdyStreams.
   QuicSpdyStream* CreateIncomingDynamicStream(QuicStreamId id) override = 0;
   QuicSpdyStream* CreateOutgoingDynamicStream(SpdyPriority priority) override =
       0;
 
   QuicSpdyStream* GetSpdyDataStream(const QuicStreamId stream_id);
 
   // If an incoming stream can be created, return true.
   virtual bool ShouldCreateIncomingDynamicStream(QuicStreamId id) = 0;
 
   // If an outgoing stream can be created, return true.
   virtual bool ShouldCreateOutgoingDynamicStream() = 0;
 
  private:
   friend class test::QuicSpdySessionPeer;
 
   std::unique_ptr<QuicHeadersStream> headers_stream_;
 
   // If set, redirect all data through the headers stream in order to
   // simulate forced HOL blocking between streams as happens in
   // HTTP/2 over TCP.
   bool force_hol_blocking_;
 
+  // Set during handshake. If true, resources in x-associated-content and link
+  // headers will be pushed.
+  bool server_push_enabled_;
+
   DISALLOW_COPY_AND_ASSIGN(QuicSpdySession);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_SPDY_SESSION_H_