Log force-alt-protocols command line flag usage.

chrome/browser/io_thread.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 "chrome/browser/io_thread.h"
 
 #include <vector>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/leak_tracker.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
+#include "base/metrics/user_metrics.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/stl_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_piece.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "base/threading/thread.h"
 #include "base/threading/worker_pool.h"
@@ skipping 874 matching lines @@
       globals_->enable_spdy_ping_based_connection_checking.set(false);
     } else if (option == kExclude) {
       globals_->forced_spdy_exclusions.insert(
           net::HostPortPair::FromURL(GURL(value)));
     } else if (option == kDisableCompression) {
       globals_->enable_spdy_compression.set(false);
     } else if (option == kDisableAltProtocols) {
       globals_->use_alternate_protocols.set(false);
     } else if (option == kForceAltProtocols) {
       net::AlternateProtocolInfo pair(443, net::NPN_SPDY_3, 1);
+      base::RecordAction(base::UserMetricsAction("Net.ForceAlternateProtocol"));
       net::HttpServerPropertiesImpl::ForceAlternateProtocol(pair);
     } else if (option == kSingleDomain) {
       DVLOG(1) << "FORCING SINGLE DOMAIN";
       globals_->force_spdy_single_domain.set(true);
     } else if (option == kInitialMaxConcurrentStreams) {
       int streams;
       if (base::StringToInt(value, &streams))
         globals_->initial_max_spdy_concurrent_streams.set(streams);
     } else if (option.empty() && it == spdy_options.begin()) {
       continue;
@@ skipping 462 matching lines @@
   net::QuicVersionVector supported_versions = net::QuicSupportedVersions();
   for (size_t i = 0; i < supported_versions.size(); ++i) {
     net::QuicVersion version = supported_versions[i];
     if (net::QuicVersionToString(version) == quic_version) {
       return version;
     }
   }
 
   return net::QUIC_VERSION_UNSUPPORTED;
 }