QUIC - Persist 1000 MRU alternate protocols to preferences file.

net/http/http_server_properties.h

Index: net/http/http_server_properties.h
diff --git a/net/http/http_server_properties.h b/net/http/http_server_properties.h
index 82c63b0dd859038ffde18e36b37ad6af4f93fb31..8d059fc200243c171a5275ded25796636fb1acbe 100644
--- a/net/http/http_server_properties.h
+++ b/net/http/http_server_properties.h
@@ -19,6 +19,15 @@
 
 namespace net {
 
+enum AlternateProtocolExperiment {
+  // 200 alternate_protocol servers are loaded (persisted 200 MRU servers).
+  ALTERNATE_PROTOCOL_NOT_PART_OF_EXPERIMENT = 0,
+  // 200 alternate_protocol servers are loaded (persisted 1000 MRU servers).
+  ALTERNATE_PROTOCOL_TRUNCATED_200_SERVERS,
+  // 1000 alternate_protocol servers are loaded (persisted 1000 MRU servers).
+  ALTERNATE_PROTOCOL_TRUNCATED_1000_SERVERS,
+};
+
 enum AlternateProtocolUsage {
   // Alternate Protocol was used without racing a normal connection.
   ALTERNATE_PROTOCOL_USAGE_NO_RACE = 0,
@@ -36,8 +45,10 @@ enum AlternateProtocolUsage {
   ALTERNATE_PROTOCOL_USAGE_MAX,
 };
 
-// Log a histogram to reflect |usage|.
-NET_EXPORT void HistogramAlternateProtocolUsage(AlternateProtocolUsage usage);
+// Log a histogram to reflect |usage| and |alternate_protocol_experiment|.
+NET_EXPORT void HistogramAlternateProtocolUsage(
+    AlternateProtocolUsage usage,
+    AlternateProtocolExperiment alternate_protocol_experiment);
 
 enum BrokenAlternateProtocolLocation {
   BROKEN_ALTERNATE_PROTOCOL_LOCATION_HTTP_STREAM_FACTORY_IMPL_JOB = 0,
@@ -157,6 +168,12 @@ class NET_EXPORT HttpServerProperties {
   // Returns all Alternate-Protocol mappings.
   virtual const AlternateProtocolMap& alternate_protocol_map() const = 0;
 
+  virtual void SetAlternateProtocolExperiment(
+      AlternateProtocolExperiment experiment) = 0;
+
+  virtual AlternateProtocolExperiment GetAlternateProtocolExperiment()
+      const = 0;
+
   // Gets a reference to the SettingsMap stored for a host.
   // If no settings are stored, returns an empty SettingsMap.
   virtual const SettingsMap& GetSpdySettings(