Implement UMA log throttling for cellular connections

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 11575c2a07a2bbecd9730853d6a3d31ebe15e34f..ec2243b1a3639c36f1e441e67884804523b1d4e2 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -47,6 +47,7 @@
 #include "components/data_usage/core/data_use_aggregator.h"
 #include "components/data_usage/core/data_use_amortizer.h"
 #include "components/data_usage/core/data_use_annotator.h"
+#include "components/metrics/metrics_service.h"
 #include "components/net_log/chrome_net_log.h"
 #include "components/policy/core/common/policy_service.h"
 #include "components/prefs/pref_registry_simple.h"
@@ -503,6 +504,8 @@ IOThread::IOThread(
   if (value)
     value->GetAsBoolean(&is_quic_allowed_by_policy_);
 
+  data_use_tracker_ = g_browser_process->metrics_service()->GetDataUseTracker();
+
   BrowserThread::SetDelegate(BrowserThread::IO, this);
 }
 
@@ -609,7 +612,7 @@ void IOThread::Init() {
           "466432 IOThread::InitAsync::ChromeNetworkDelegate"));
   scoped_ptr<ChromeNetworkDelegate> chrome_network_delegate(
       new ChromeNetworkDelegate(extension_event_router_forwarder(),
-                                &system_enable_referrers_));
+                                &system_enable_referrers_, data_use_tracker_));
   // By default, data usage is considered off the record.
   chrome_network_delegate->set_data_use_aggregator(
       globals_->data_use_aggregator.get(),