Revert of Remove support for Alt-Svc/Alternate Protocol Probability

ios/crnet/crnet_environment.h

 // Copyright 2014 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 IOS_CRNET_CRNET_ENVIRONMENT_H_
 #define IOS_CRNET_CRNET_ENVIRONMENT_H_
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 74 matching lines @@
 
   // Setters and getters for |spdy_enabled_|, |quic_enabled_|, and
   // |forced_quic_origin_|. These only have any effect before Install() is
   // called.
   void set_spdy_enabled(bool enabled) { spdy_enabled_ = enabled; }
   void set_quic_enabled(bool enabled) { quic_enabled_ = enabled; }
   void set_sdch_enabled(bool enabled) { sdch_enabled_ = enabled; }
   void set_sdch_pref_store_filename(const std::string& pref_store) {
     sdch_pref_store_filename_ = pref_store;
   }
+  void set_alternate_protocol_threshold(double threshold) {
+    alternate_protocol_threshold_ = threshold;
+  }
 
   bool spdy_enabled() const { return spdy_enabled_; }
   bool quic_enabled() const { return quic_enabled_; }
   bool sdch_enabled() const { return sdch_enabled_; }
+  double alternate_protocol_threshold() const {
+    return alternate_protocol_threshold_;
+  }
 
   // Clears the network stack's disk cache.
   void ClearCache(ClearCacheCallback callback);
 
  private:
   // Runs a closure on the network thread.
   void PostToNetworkThread(const tracked_objects::Location& from_here,
                            const base::Closure& task);
 
   // Configures SDCH on the network thread. If SDCH is enabled, sets up
@@ skipping 19 matching lines @@
       net::URLRequestContext* context);
 
   // Helper method that closes all current SPDY sessions on the network IO
   // thread.
   void CloseAllSpdySessionsInternal();
 
   bool spdy_enabled_;
   bool quic_enabled_;
   bool sdch_enabled_;
   std::string sdch_pref_store_filename_;
+  double alternate_protocol_threshold_;
 
   static CrNetEnvironment* chrome_net_;
   scoped_ptr<base::Thread> network_io_thread_;
   scoped_ptr<base::Thread> network_cache_thread_;
   scoped_ptr<base::Thread> file_thread_;
   scoped_ptr<base::Thread> file_user_blocking_thread_;
   scoped_ptr<net::SdchManager> sdch_manager_;
   scoped_ptr<net::SdchOwner> sdch_owner_;
   scoped_refptr<base::SequencedTaskRunner> pref_store_worker_pool_;
   scoped_refptr<JsonPrefStore> net_pref_store_;
   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   scoped_ptr<net::ProxyConfigService> proxy_config_service_;
   scoped_ptr<net::HttpServerProperties> http_server_properties_;
   scoped_refptr<net::URLRequestContextGetter> main_context_getter_;
   scoped_ptr<net::URLRequestContext> main_context_;
   scoped_ptr<CrNetHttpProtocolHandlerDelegate> http_protocol_handler_delegate_;
   std::string user_agent_product_name_;
   scoped_ptr<net::NetLog> net_log_;
   scoped_ptr<net::WriteToFileNetLogObserver> net_log_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(CrNetEnvironment);
 };
 
 #endif  // IOS_CRNET_CRNET_ENVIRONMENT_H_