Add a probability to Alternate-Protocol support.

net/http/http_server_properties_impl.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_SERVER_PROPERTIES_IMPL_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 37 matching lines @@
                          size_t max_size) const;
 
   // Returns flattened string representation of the |host_port_pair|. Used by
   // unittests.
   static std::string GetFlattenedSpdyServer(
       const net::HostPortPair& host_port_pair);
 
   // Debugging to simulate presence of an AlternateProtocol.
   // If we don't have an alternate protocol in the map for any given host/port
   // pair, force this ProtocolPortPair.
-  static void ForceAlternateProtocol(const PortAlternateProtocolPair& pair);
+  static void ForceAlternateProtocol(const AlternateProtocolInfo& pair);
   static void DisableForcedAlternateProtocol();
 
   // Returns the canonical host suffix for |server|, or std::string() if none
   // exists.
   std::string GetCanonicalSuffix(const net::HostPortPair& server);
 
   // -----------------------------
   // HttpServerProperties methods:
   // -----------------------------
 
   // Gets a weak pointer for this object.
   virtual base::WeakPtr<HttpServerProperties> GetWeakPtr() OVERRIDE;
 
   // Deletes all data.
   virtual void Clear() OVERRIDE;
 
   // Returns true if |server| supports SPDY.
   virtual bool SupportsSpdy(const HostPortPair& server) OVERRIDE;
 
   // Add |server| into the persistent store.
   virtual void SetSupportsSpdy(const HostPortPair& server,
                                bool support_spdy) OVERRIDE;
 
   // Returns true if |server| has an Alternate-Protocol header.
   virtual bool HasAlternateProtocol(const HostPortPair& server) OVERRIDE;
 
   // Returns the Alternate-Protocol and port for |server|.
   // HasAlternateProtocol(server) must be true.
-  virtual PortAlternateProtocolPair GetAlternateProtocol(
+  virtual AlternateProtocolInfo GetAlternateProtocol(
       const HostPortPair& server) OVERRIDE;
 
   // Sets the Alternate-Protocol for |server|.
   virtual void SetAlternateProtocol(
       const HostPortPair& server,
       uint16 alternate_port,
-      AlternateProtocol alternate_protocol) OVERRIDE;
+      AlternateProtocol alternate_protocol,
+      double probability) OVERRIDE;
 
   // Sets the Alternate-Protocol for |server| to be BROKEN.
   virtual void SetBrokenAlternateProtocol(const HostPortPair& server) OVERRIDE;
 
   // Returns true if Alternate-Protocol for |server| was recently BROKEN.
   virtual bool WasAlternateProtocolRecentlyBroken(
       const HostPortPair& server) OVERRIDE;
 
   // Confirms that Alternate-Protocol for |server| is working.
   virtual void ConfirmAlternateProtocol(const HostPortPair& server) OVERRIDE;
 
   // Clears the Alternate-Protocol for |server|.
   virtual void ClearAlternateProtocol(const HostPortPair& server) OVERRIDE;
 
   // Returns all Alternate-Protocol mappings.
   virtual const AlternateProtocolMap& alternate_protocol_map() const OVERRIDE;
 
   virtual void SetAlternateProtocolExperiment(
       AlternateProtocolExperiment experiment) OVERRIDE;
 
+  virtual void SetAlternateProtocolProbabilityThreshold(
+      double threshold) OVERRIDE;
+
   virtual AlternateProtocolExperiment GetAlternateProtocolExperiment()
       const OVERRIDE;
 
   // Gets a reference to the SettingsMap stored for a host.
   // If no settings are stored, returns an empty SettingsMap.
   virtual const SettingsMap& GetSpdySettings(
       const HostPortPair& host_port_pair) OVERRIDE;
 
   // Saves an individual SPDY setting for a host. Returns true if SPDY setting
   // is to be persisted.
@@ skipping 52 matching lines @@
   SpdySettingsMap spdy_settings_map_;
   ServerNetworkStatsMap server_network_stats_map_;
   // Contains a map of servers which could share the same alternate protocol.
   // Map from a Canonical host/port (host is some postfix of host names) to an
   // actual origin, which has a plausible alternate protocol mapping.
   CanonicalHostMap canonical_host_to_origin_map_;
   // Contains list of suffixes (for exmaple ".c.youtube.com",
   // ".googlevideo.com", ".googleusercontent.com") of canoncial hostnames.
   CanonicalSufficList canoncial_suffixes_;
 
+  double alternate_protocol_probability_threshold_;
+
   base::WeakPtrFactory<HttpServerPropertiesImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpServerPropertiesImpl);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_IMPL_H_