Respect QuicAllowed policy for new streams

net/http/http_network_session.cc

Index: net/http/http_network_session.cc
diff --git a/net/http/http_network_session.cc b/net/http/http_network_session.cc
index 3b2ca28d9fe3fb33557f429cd546c39354303c1d..6c11ecc6b7dfd9f8239450fc8cbe77b29192a80a 100644
--- a/net/http/http_network_session.cc
+++ b/net/http/http_network_session.cc
@@ -73,23 +73,24 @@ const int32_t kSpdyStreamMaxRecvWindowSize = 6 * 1024 * 1024;    //  6 MB
 const int32_t kQuicSocketReceiveBufferSize = 1024 * 1024;  // 1MB
 
 HttpNetworkSession::Params::Params()
-    : client_socket_factory(NULL),
-      host_resolver(NULL),
-      cert_verifier(NULL),
-      channel_id_service(NULL),
-      transport_security_state(NULL),
-      cert_transparency_verifier(NULL),
-      ct_policy_enforcer(NULL),
-      proxy_service(NULL),
-      ssl_config_service(NULL),
-      http_auth_handler_factory(NULL),
-      net_log(NULL),
-      host_mapping_rules(NULL),
-      socket_performance_watcher_factory(NULL),
+    : client_socket_factory(nullptr),
+      host_resolver(nullptr),
+      cert_verifier(nullptr),
+      channel_id_service(nullptr),
+      transport_security_state(nullptr),
+      cert_transparency_verifier(nullptr),
+      ct_policy_enforcer(nullptr),
+      proxy_service(nullptr),
+      ssl_config_service(nullptr),
+      http_auth_handler_factory(nullptr),
+      net_log(nullptr),
+      host_mapping_rules(nullptr),
+      socket_performance_watcher_factory(nullptr),
       ignore_certificate_errors(false),
       testing_fixed_http_port(0),
       testing_fixed_https_port(0),
       enable_tcp_fast_open_for_ssl(false),
+      dynamic_shared_params(nullptr),
       enable_spdy_ping_based_connection_checking(true),
       enable_http2(true),
       spdy_session_max_recv_window_size(kSpdySessionMaxRecvWindowSize),
@@ -97,7 +98,6 @@ HttpNetworkSession::Params::Params()
       time_func(&base::TimeTicks::Now),
       enable_http2_alternative_service_with_different_host(false),
       enable_quic_alternative_service_with_different_host(true),
-      enable_quic(false),
       disable_quic_on_timeout_with_open_streams(false),
       quic_always_require_handshake_confirmation(false),
       quic_disable_connection_pooling(false),
@@ -109,8 +109,8 @@ HttpNetworkSession::Params::Params()
       quic_socket_receive_buffer_size(kQuicSocketReceiveBufferSize),
       quic_delay_tcp_race(true),
       quic_max_server_configs_stored_in_properties(0u),
-      quic_clock(NULL),
-      quic_random(NULL),
+      quic_clock(nullptr),
+      quic_random(nullptr),
       quic_max_packet_length(kDefaultMaxPacketSize),
       enable_user_alternate_protocol_ports(false),
       quic_crypto_client_stream_factory(
@@ -128,7 +128,7 @@ HttpNetworkSession::Params::Params()
       quic_force_hol_blocking(false),
       quic_race_cert_verification(false),
       quic_do_not_fragment(false),
-      proxy_delegate(NULL),
+      proxy_delegate(nullptr),
       enable_token_binding(false),
       http_09_on_non_default_ports_enabled(false) {
   quic_supported_versions.push_back(QUIC_VERSION_35);
@@ -138,6 +138,15 @@ HttpNetworkSession::Params::Params(const Params& other) = default;
 
 HttpNetworkSession::Params::~Params() {}
 
+bool HttpNetworkSession::Params::enable_quic() const {
+  return dynamic_shared_params && dynamic_shared_params->enable_quic;
+}
+
+HttpNetworkSession::DynamicSharedParams::DynamicSharedParams()
+    : enable_quic(false) {}
+
+HttpNetworkSession::DynamicSharedParams::~DynamicSharedParams() {}
+
 // TODO(mbelshe): Move the socket factories into HttpStreamFactory.
 HttpNetworkSession::HttpNetworkSession(const Params& params)
     : net_log_(params.net_log),
@@ -292,7 +301,7 @@ std::unique_ptr<base::Value> HttpNetworkSession::SpdySessionPoolInfoToValue()
 std::unique_ptr<base::Value> HttpNetworkSession::QuicInfoToValue() const {
   std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
   dict->Set("sessions", quic_stream_factory_.QuicStreamFactoryInfoToValue());
-  dict->SetBoolean("quic_enabled", params_.enable_quic);
+  dict->SetBoolean("quic_enabled", params_.enable_quic());
   std::unique_ptr<base::ListValue> connection_options(new base::ListValue);
   for (QuicTagVector::const_iterator it =
            params_.quic_connection_options.begin();
@@ -358,7 +367,7 @@ bool HttpNetworkSession::IsProtocolEnabled(NextProto protocol) const {
     case kProtoHTTP2:
       return params_.enable_http2;
     case kProtoQUIC:
-      return params_.enable_quic;
+      return params_.enable_quic();
   }
   NOTREACHED();
   return false;