Update from chromium https://crrev.com/301315

net/http/http_server_properties_manager.cc

 // 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.
 
 #include "net/http/http_server_properties_manager.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
-#include "base/rand_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/values.h"
 
 namespace net {
 
 namespace {
@@ skipping 16 matching lines @@
 
 // "version" 0 indicates, http_server_properties doesn't have "version"
 // property.
 const int kMissingVersion = 0;
 
 // The version number of persisted http_server_properties.
 const int kVersionNumber = 3;
 
 typedef std::vector<std::string> StringVector;
 
-// Load either 200 or 1000 servers based on a coin flip.
-const int k200AlternateProtocolHostsToLoad = 200;
-const int k1000AlternateProtocolHostsToLoad = 1000;
-// Persist 1000 MRU AlternateProtocolHostPortPairs.
-const int kMaxAlternateProtocolHostsToPersist = 1000;
+// Persist 200 MRU AlternateProtocolHostPortPairs.
+const int kMaxAlternateProtocolHostsToPersist = 200;
 
 // Persist 200 MRU SpdySettingsHostPortPairs.
 const int kMaxSpdySettingsHostsToPersist = 200;
 
 // Persist 300 MRU SupportsSpdyServerHostPortPairs.
 const int kMaxSupportsSpdyServerHostsToPersist = 300;
 
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 144 matching lines @@
   http_server_properties_impl_->ClearAlternateProtocol(server);
   ScheduleUpdatePrefsOnNetworkThread();
 }
 
 const net::AlternateProtocolMap&
 HttpServerPropertiesManager::alternate_protocol_map() const {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
   return http_server_properties_impl_->alternate_protocol_map();
 }
 
-void HttpServerPropertiesManager::SetAlternateProtocolExperiment(
-    AlternateProtocolExperiment experiment) {
-  DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
-  http_server_properties_impl_->SetAlternateProtocolExperiment(experiment);
-}
-
 void HttpServerPropertiesManager::SetAlternateProtocolProbabilityThreshold(
     double threshold) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
   http_server_properties_impl_->SetAlternateProtocolProbabilityThreshold(
       threshold);
 }
 
-AlternateProtocolExperiment
-HttpServerPropertiesManager::GetAlternateProtocolExperiment() const {
-  DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
-  return http_server_properties_impl_->GetAlternateProtocolExperiment();
-}
-
 const SettingsMap& HttpServerPropertiesManager::GetSpdySettings(
     const HostPortPair& host_port_pair) {
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
   return http_server_properties_impl_->GetSpdySettings(host_port_pair);
 }
 
 bool HttpServerPropertiesManager::SetSpdySetting(
     const HostPortPair& host_port_pair,
     SpdySettingsIds id,
     SpdySettingsFlags flags,
@@ skipping 111 matching lines @@
   }
 
   // String is host/port pair of spdy server.
   scoped_ptr<StringVector> spdy_servers(new StringVector);
   scoped_ptr<net::SpdySettingsMap> spdy_settings_map(
       new net::SpdySettingsMap(kMaxSpdySettingsHostsToPersist));
   scoped_ptr<net::AlternateProtocolMap> alternate_protocol_map(
       new net::AlternateProtocolMap(kMaxAlternateProtocolHostsToPersist));
   scoped_ptr<net::SupportsQuicMap> supports_quic_map(
       new net::SupportsQuicMap());
-  // TODO(rtenneti): Delete the following code after the experiment.
-  int alternate_protocols_to_load = k200AlternateProtocolHostsToLoad;
-  net::AlternateProtocolExperiment alternate_protocol_experiment =
-      net::ALTERNATE_PROTOCOL_NOT_PART_OF_EXPERIMENT;
-  if (version == kVersionNumber) {
-    if (base::RandInt(0, 99) == 0) {
-      alternate_protocol_experiment =
-          net::ALTERNATE_PROTOCOL_TRUNCATED_200_SERVERS;
-    } else {
-      alternate_protocols_to_load = k1000AlternateProtocolHostsToLoad;
-      alternate_protocol_experiment =
-          net::ALTERNATE_PROTOCOL_TRUNCATED_1000_SERVERS;
-    }
-    DVLOG(1) << "# of servers that support alternate_protocol: "
-             << alternate_protocols_to_load;
-  }
 
   int count = 0;
   for (base::DictionaryValue::Iterator it(*servers_dict); !it.IsAtEnd();
        it.Advance()) {
     // Get server's host/pair.
     const std::string& server_str = it.key();
     net::HostPortPair server = net::HostPortPair::FromString(server_str);
     if (server.host().empty()) {
       DVLOG(1) << "Malformed http_server_properties for server: " << server_str;
       detected_corrupted_prefs = true;
@@ skipping 46 matching lines @@
 
     // Get alternate_protocol server.
     DCHECK(alternate_protocol_map->Peek(server) ==
            alternate_protocol_map->end());
     const base::DictionaryValue* port_alternate_protocol_dict = NULL;
     if (!server_pref_dict->GetDictionaryWithoutPathExpansion(
             "alternate_protocol", &port_alternate_protocol_dict)) {
       continue;
     }
 
-    if (count >= alternate_protocols_to_load)
+    if (count >= kMaxAlternateProtocolHostsToPersist)
       continue;
     do {
       int port = 0;
       if (!port_alternate_protocol_dict->GetIntegerWithoutPathExpansion(
               "port", &port) ||
           (port > (1 << 16))) {
         DVLOG(1) << "Malformed Alternate-Protocol server: " << server_str;
         detected_corrupted_prefs = true;
         continue;
       }
@@ skipping 56 matching lines @@
   }
 
   network_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(
           &HttpServerPropertiesManager::UpdateCacheFromPrefsOnNetworkThread,
           base::Unretained(this),
           base::Owned(spdy_servers.release()),
           base::Owned(spdy_settings_map.release()),
           base::Owned(alternate_protocol_map.release()),
-          alternate_protocol_experiment,
           base::Owned(supports_quic_map.release()),
           detected_corrupted_prefs));
 }
 
 void HttpServerPropertiesManager::UpdateCacheFromPrefsOnNetworkThread(
     StringVector* spdy_servers,
     net::SpdySettingsMap* spdy_settings_map,
     net::AlternateProtocolMap* alternate_protocol_map,
-    net::AlternateProtocolExperiment alternate_protocol_experiment,
     net::SupportsQuicMap* supports_quic_map,
     bool detected_corrupted_prefs) {
   // Preferences have the master data because admins might have pushed new
   // preferences. Update the cached data with new data from preferences.
   DCHECK(network_task_runner_->RunsTasksOnCurrentThread());
 
   UMA_HISTOGRAM_COUNTS("Net.CountOfSpdyServers", spdy_servers->size());
   http_server_properties_impl_->InitializeSpdyServers(spdy_servers, true);
 
   // Update the cached data and use the new spdy_settings from preferences.
   UMA_HISTOGRAM_COUNTS("Net.CountOfSpdySettings", spdy_settings_map->size());
   http_server_properties_impl_->InitializeSpdySettingsServers(
       spdy_settings_map);
 
   // Update the cached data and use the new Alternate-Protocol server list from
   // preferences.
   UMA_HISTOGRAM_COUNTS("Net.CountOfAlternateProtocolServers",
                        alternate_protocol_map->size());
   http_server_properties_impl_->InitializeAlternateProtocolServers(
       alternate_protocol_map);
-  http_server_properties_impl_->SetAlternateProtocolExperiment(
-      alternate_protocol_experiment);
 
   http_server_properties_impl_->InitializeSupportsQuic(supports_quic_map);
 
   // Update the prefs with what we have read (delete all corrupted prefs).
   if (detected_corrupted_prefs)
     ScheduleUpdatePrefsOnNetworkThread();
 }
 
 //
 // Update Preferences with data from the cached data.
@@ skipping 258 matching lines @@
     completion.Run();
 }
 
 void HttpServerPropertiesManager::OnHttpServerPropertiesChanged() {
   DCHECK(pref_task_runner_->RunsTasksOnCurrentThread());
   if (!setting_prefs_)
     ScheduleUpdateCacheOnPrefThread();
 }
 
 }  // namespace net