ScopedTrackers to help pin down where IOThread::InitSystemRequestContextOnIOThread is janky

net/http/http_network_session.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_network_session.h"
 
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "net/http/http_auth_handler_factory.h"
 #include "net/http/http_response_body_drainer.h"
 #include "net/http/http_stream_factory_impl.h"
 #include "net/http/url_security_manager.h"
 #include "net/proxy/proxy_service.h"
 #include "net/quic/crypto/quic_random.h"
 #include "net/quic/quic_clock.h"
 #include "net/quic/quic_crypto_client_stream_factory.h"
 #include "net/quic/quic_protocol.h"
 #include "net/quic/quic_stream_factory.h"
 #include "net/quic/quic_utils.h"
 #include "net/socket/client_socket_factory.h"
 #include "net/socket/client_socket_pool_manager_impl.h"
 #include "net/socket/next_proto.h"
 #include "net/socket/ssl_client_socket.h"
 #include "net/spdy/hpack_huffman_aggregator.h"
 #include "net/spdy/spdy_session_pool.h"
 
 namespace {
 
 net::ClientSocketPoolManager* CreateSocketPoolManager(
     net::HttpNetworkSession::SocketPoolType pool_type,
     const net::HttpNetworkSession::Params& params) {
+  // TODO(michaeln): Remove ScopedTracker below once crbug.com/454983 is fixed
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "454983 CreateSocketPoolManager"));
   // TODO(yutak): Differentiate WebSocket pool manager and allow more
   // simultaneous connections for WebSockets.
   return new net::ClientSocketPoolManagerImpl(
       params.net_log, params.client_socket_factory
                           ? params.client_socket_factory
                           : net::ClientSocketFactory::GetDefaultFactory(),
       params.host_resolver, params.cert_verifier, params.channel_id_service,
       params.transport_security_state, params.cert_transparency_verifier,
       params.cert_policy_enforcer, params.ssl_session_cache_shard,
       params.ssl_config_service, params.enable_ssl_connect_job_waiting,
@@ skipping 101 matching lines @@
                          params.spdy_initial_max_concurrent_streams,
                          params.spdy_max_concurrent_streams_limit,
                          params.time_func,
                          params.trusted_spdy_proxy),
       http_stream_factory_(new HttpStreamFactoryImpl(this, false)),
       http_stream_factory_for_websocket_(new HttpStreamFactoryImpl(this, true)),
       params_(params) {
   DCHECK(proxy_service_);
   DCHECK(ssl_config_service_.get());
   CHECK(http_server_properties_);
+  // TODO(michaeln): Remove ScopedTracker below once crbug.com/454983 is fixed
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "454983 HttpNetworkSession::HttpNetworkSession"));
 
   for (int i = ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION;
        i <= ALTERNATE_PROTOCOL_MAXIMUM_VALID_VERSION; ++i) {
     enabled_protocols_[i - ALTERNATE_PROTOCOL_MINIMUM_VALID_VERSION] = false;
   }
 
   // TODO(rtenneti): bug 116575 - consider combining the NextProto and
   // AlternateProtocol.
   for (std::vector<NextProto>::const_iterator it = params_.next_protos.begin();
        it != params_.next_protos.end(); ++it) {
@@ skipping 142 matching lines @@
     case WEBSOCKET_SOCKET_POOL:
       return websocket_socket_pool_manager_.get();
     default:
       NOTREACHED();
       break;
   }
   return NULL;
 }
 
 }  //  namespace net