Implement UMA log throttling for cellular connections

chrome/browser/net/chrome_network_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_
 #define CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "components/data_use_measurement/content/data_use_measurement.h"
+#include "components/metrics/data_use_tracker.h"
 #include "net/base/network_delegate_impl.h"
 
 class ChromeExtensionsNetworkDelegate;
 class PrefService;
 
 template<class T> class PrefMember;
 
 typedef PrefMember<bool> BooleanPrefMember;
 
 namespace base {
@@ skipping 30 matching lines @@
 class URLBlacklistManager;
 }
 
 // ChromeNetworkDelegate is the central point from within the chrome code to
 // add hooks into the network stack.
 class ChromeNetworkDelegate : public net::NetworkDelegateImpl {
  public:
   // |enable_referrers| (and all of the other optional PrefMembers) should be
   // initialized on the UI thread (see below) beforehand. This object's owner is
   // responsible for cleaning them up at shutdown.
-  ChromeNetworkDelegate(extensions::EventRouterForwarder* event_router,
-                        BooleanPrefMember* enable_referrers);
+  ChromeNetworkDelegate(
+      extensions::EventRouterForwarder* event_router,
+      BooleanPrefMember* enable_referrers,
+      metrics::UpdateUsagePrefCallbackType metrics_data_use_forwarder);

[Alexei Svitkine (slow), 2016/03/31 04:32:25]

Pass by const ref. Do the same in other places you pass the callback as a param.

[gayane -on leave until 09-2017, 2016/03/31 17:54:57]

Done.

   ~ChromeNetworkDelegate() override;
 
   // Pass through to ChromeExtensionsNetworkDelegate::set_extension_info_map().
   void set_extension_info_map(extensions::InfoMap* extension_info_map);
 
   void set_url_blacklist_manager(
       const policy::URLBlacklistManager* url_blacklist_manager) {
     url_blacklist_manager_ = url_blacklist_manager;
   }
 
@@ skipping 137 matching lines @@
 
   // Aggregates and reports network usage.
   data_usage::DataUseAggregator* data_use_aggregator_;
   // Controls whether network usage is reported as being off the record.
   bool is_data_usage_off_the_record_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeNetworkDelegate);
 };
 
 #endif  // CHROME_BROWSER_NET_CHROME_NETWORK_DELEGATE_H_