QUIC - Persist 1000 MRU alternate protocols to preferences file.

net/http/http_server_properties.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_server_properties.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/stringprintf.h"
 
@@ skipping 13 matching lines @@
   "quic"
 };
 const char kBrokenAlternateProtocol[] = "Broken";
 
 COMPILE_ASSERT(
     arraysize(kAlternateProtocolStrings) == NUM_VALID_ALTERNATE_PROTOCOLS,
     kAlternateProtocolStringsSize_kNumValidAlternateProtocols_not_equal);
 
 }  // namespace
 
-void HistogramAlternateProtocolUsage(AlternateProtocolUsage usage) {
+void HistogramAlternateProtocolUsage(
+    AlternateProtocolUsage usage,
+    AlternateProtocolExperiment alternate_protocol_experiment) {
   UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsage", usage,
                             ALTERNATE_PROTOCOL_USAGE_MAX);
+  if (alternate_protocol_experiment ==
+      ALTERNATE_PROTOCOL_TRUNCATED_200_SERVERS) {
+    UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsage.200Truncated", usage,
+                              ALTERNATE_PROTOCOL_USAGE_MAX);
+  } else if (alternate_protocol_experiment ==
+      ALTERNATE_PROTOCOL_TRUNCATED_1000_SERVERS) {
+    UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolUsage.1000Truncated", usage,
+                              ALTERNATE_PROTOCOL_USAGE_MAX);
+  }
 }
 
 void HistogramBrokenAlternateProtocolLocation(
     BrokenAlternateProtocolLocation location){
   UMA_HISTOGRAM_ENUMERATION("Net.AlternateProtocolBrokenLocation", location,
                             BROKEN_ALTERNATE_PROTOCOL_LOCATION_MAX);
 }
 
 bool IsAlternateProtocolValid(AlternateProtocol protocol) {
   return protocol >= ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION &&
@@ skipping 52 matching lines @@
   NOTREACHED() << "Invalid NextProto: " << next_proto;
   return UNINITIALIZED_ALTERNATE_PROTOCOL;
 }
 
 std::string PortAlternateProtocolPair::ToString() const {
   return base::StringPrintf("%d:%s", port,
                             AlternateProtocolToString(protocol));
 }
 
 }  // namespace net