Add a probability to Alternate-Protocol support.

net/http/http_network_session.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/http/http_network_session.h"
 
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/debug/stack_trace.h"
@@ skipping 63 matching lines @@
       enable_spdy_compression(true),
       enable_spdy_ping_based_connection_checking(true),
       spdy_default_protocol(kProtoUnknown),
       spdy_stream_initial_recv_window_size(0),
       spdy_initial_max_concurrent_streams(0),
       spdy_max_concurrent_streams_limit(0),
       time_func(&base::TimeTicks::Now),
       force_spdy_over_ssl(true),
       force_spdy_always(false),
       use_alternate_protocols(false),
+      alternate_protocol_probability_threshold(0),
       enable_websocket_over_spdy(false),
       enable_quic(false),
       enable_quic_port_selection(true),
       enable_quic_pacing(false),
       enable_quic_time_based_loss_detection(false),
       enable_quic_persist_server_info(false),
       quic_clock(NULL),
       quic_random(NULL),
       quic_max_packet_length(kDefaultMaxPacketSize),
       enable_user_alternate_protocol_ports(false),
@@ skipping 81 matching lines @@
         continue;
       }
       enabled_protocols_[alternate - ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION] =
           true;
     }
   }
 
   if (HpackHuffmanAggregator::UseAggregator()) {
     huffman_aggregator_.reset(new HpackHuffmanAggregator());
   }
+
+  http_server_properties_->SetAlternateProtocolProbabilityThreshold(
+      params.alternate_protocol_probability_threshold);
 }
 
 HttpNetworkSession::~HttpNetworkSession() {
   STLDeleteElements(&response_drainers_);
   spdy_session_pool_.CloseAllSessions();
 }
 
 void HttpNetworkSession::AddResponseDrainer(HttpResponseBodyDrainer* drainer) {
   DCHECK(!ContainsKey(response_drainers_, drainer));
   response_drainers_.insert(drainer);
@@ skipping 103 matching lines @@
     case WEBSOCKET_SOCKET_POOL:
       return websocket_socket_pool_manager_.get();
     default:
       NOTREACHED();
       break;
   }
   return NULL;
 }
 
 }  //  namespace net