Respect QuicAllowed policy for new streams

net/http/http_network_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.
 
 #ifndef NET_HTTP_HTTP_NETWORK_SESSION_H_
 #define NET_HTTP_HTTP_NETWORK_SESSION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 50 matching lines @@
 class SSLClientSocketPool;
 class SSLConfigService;
 class TransportClientSocketPool;
 class TransportSecurityState;
 
 // This class holds session objects used by HttpNetworkTransaction objects.
 class NET_EXPORT HttpNetworkSession
     : NON_EXPORTED_BASE(public base::NonThreadSafe),
       public base::MemoryCoordinatorClient {
  public:
+  // Shared Dynamic Parameters - holds parameters which can change at run time.
+  // One e instance of this struct is intended to be shared accross multiple

[mmenke, 2016/12/13 18:48:54]

"One e" -> "One"

[pmarko, 2016/12/19 21:25:11]

Done.

+  // HttpNetworkSessions (the default copy constructor of Params just copies the
+  // pointer to SharedParams).
+  struct NET_EXPORT DynamicSharedParams {
+    DynamicSharedParams();
+    DynamicSharedParams(const DynamicSharedParams& other);
+    ~DynamicSharedParams();
+
+    // Enables QUIC for new streams (if QUIC is enabled).
+    // If DynamicSharedParams is missing, assume true.
+    // This is intended for disabling QUIC for new streams by user policy
+    // after the net stack has been initialized.
+    bool enable_quic_for_new_streams;
+  };
+
   struct NET_EXPORT Params {
     Params();
     Params(const Params& other);
     ~Params();
 
     ClientSocketFactory* client_socket_factory;
     HostResolver* host_resolver;
     CertVerifier* cert_verifier;
     ChannelIDService* channel_id_service;
     TransportSecurityState* transport_security_state;
     CTVerifier* cert_transparency_verifier;
     CTPolicyEnforcer* ct_policy_enforcer;
     ProxyService* proxy_service;
     SSLConfigService* ssl_config_service;
     HttpAuthHandlerFactory* http_auth_handler_factory;
     HttpServerProperties* http_server_properties;
     NetLog* net_log;
     HostMappingRules* host_mapping_rules;
     SocketPerformanceWatcherFactory* socket_performance_watcher_factory;
     bool ignore_certificate_errors;
     uint16_t testing_fixed_http_port;
     uint16_t testing_fixed_https_port;
     bool enable_tcp_fast_open_for_ssl;
 
+    // Holds parameters which can change after initialization
+    // and can be shared accross multiple HttpNetworkSessions.
+    // By default, the pointer is inherited on copy.
+    // May be NULL.
+    DynamicSharedParams* dynamic_shared_params;
+
     // Use SPDY ping frames to test for connection health after idle.
     bool enable_spdy_ping_based_connection_checking;
     bool enable_http2;
     size_t spdy_session_max_recv_window_size;
     size_t spdy_stream_max_recv_window_size;
     // Source of time for SPDY connections.
     SpdySessionPool::TimeFunc time_func;
     // Whether to enable HTTP/2 Alt-Svc entries with hostname different than
     // that of the origin.
     bool enable_http2_alternative_service_with_different_host;
@@ skipping 83 matching lines @@
     // If true, configure QUIC sockets to not fragment packets.
     bool quic_do_not_fragment;
 
     ProxyDelegate* proxy_delegate;
     // Enable support for Token Binding.
     bool enable_token_binding;
 
     // Enable HTTP/0.9 for HTTP/HTTPS on ports other than the default one for
     // each protocol.
     bool http_09_on_non_default_ports_enabled;
+
+    // Evaluates if QUIC is enabled for new streams
+    // This takes into account the general quic_enabled Params member as well
+    // as shared_params, if shared_params was set.
+    bool enable_quic_for_new_streams() const;
   };
 
   enum SocketPoolType {
     NORMAL_SOCKET_POOL,
     WEBSOCKET_SOCKET_POOL,
     NUM_SOCKET_POOL_TYPES
   };
 
   explicit HttpNetworkSession(const Params& params);
   ~HttpNetworkSession() override;
@@ skipping 107 matching lines @@
   NextProtoVector next_protos_;
 
   Params params_;
 
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_SESSION_H_