Create component to expose network usage stats to consumers.

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"
@@ skipping 22 matching lines @@
 #include "chrome/browser/net/chrome_network_delegate.h"
 #include "chrome/browser/net/connect_interceptor.h"
 #include "chrome/browser/net/dns_probe_service.h"
 #include "chrome/browser/net/proxy_service_factory.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_prefs.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_params.h"
+#include "components/data_usage/core/data_use_aggregator.h"
 #include "components/net_log/chrome_net_log.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/proxy_config/pref_proxy_config_tracker.h"
 #include "components/variations/variations_associated_data.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/cookie_store_factory.h"
 #include "content/public/common/user_agent.h"
 #include "net/base/external_estimate_provider.h"
 #include "net/base/host_mapping_rules.h"
@@ skipping 507 matching lines @@
       new LoggingNetworkChangeObserver(net_log_));
 
   // Setup the HistogramWatcher to run on the IO thread.
   net::NetworkChangeNotifier::InitHistogramWatcher();
 
 #if defined(ENABLE_EXTENSIONS)
   globals_->extension_event_router_forwarder =
       extension_event_router_forwarder_;
 #endif
 
+  globals_->data_use_aggregator.reset(new data_usage::DataUseAggregator());
+
   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
   // is fixed.
   tracked_objects::ScopedTracker tracking_profile3(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "466432 IOThread::InitAsync::ChromeNetworkDelegate"));
   scoped_ptr<ChromeNetworkDelegate> chrome_network_delegate(
       new ChromeNetworkDelegate(extension_event_router_forwarder(),
                                 &system_enable_referrers_));
+  // By default, data usage is considered off the record.
+  chrome_network_delegate->set_data_use_aggregator(
+      globals_->data_use_aggregator.get(),
+      true /* is_data_usage_off_the_record */);

[bengr, 2015/10/06 19:30:27]

Why the underscores?

[sclittle, 2015/10/07 01:07:55]

Because that's what the argument name is, |is_data_usage_off_the_record|.

[tbansal1, 2015/10/08 04:22:44]

nit, I think the right syntax is: /*is_data_usage_off_the_record=*/true
(at least I have been told so :P)

See this:
https://code.google.com/p/chromium/codesearch#search/&q=f:src/net%20=%5C*%5C/...

[sclittle, 2015/10/08 19:44:13]

It looks like both styles are used, most of the cases I found are using the
"value /* arg_name */" format though:
https://code.google.com/p/chromium/codesearch#search/&q=lang:c%2B%2B%20%22/*%...

So I'll leave this as-is.

 
   // TODO(erikchen): Remove ScopedTracker below once http://crbug.com/466432
   // is fixed.
   tracked_objects::ScopedTracker tracking_profile4(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "466432 IOThread::InitAsync::CreateGlobalHostResolver"));
   globals_->system_network_delegate = chrome_network_delegate.Pass();
   globals_->host_resolver = CreateGlobalHostResolver(net_log_);
 
   std::map<std::string, std::string> network_quality_estimator_params;
@@ skipping 997 matching lines @@
   globals->proxy_script_fetcher_url_request_job_factory = job_factory.Pass();
 
   context->set_job_factory(
       globals->proxy_script_fetcher_url_request_job_factory.get());
 
   // TODO(rtenneti): We should probably use HttpServerPropertiesManager for the
   // system URLRequestContext too. There's no reason this should be tied to a
   // profile.
   return context;
 }