Implement UMA log throttling for cellular connections

chrome/browser/net/chrome_network_delegate.cc

Index: chrome/browser/net/chrome_network_delegate.cc
diff --git a/chrome/browser/net/chrome_network_delegate.cc b/chrome/browser/net/chrome_network_delegate.cc
index ee6dff8e6cfcd91d612f1c1152431c0d502033e5..bb0c71f57e5e8d8f65c585d2b520f99f824f9112 100644
--- a/chrome/browser/net/chrome_network_delegate.cc
+++ b/chrome/browser/net/chrome_network_delegate.cc
@@ -286,7 +286,8 @@ void RecordCacheStateStats(const net::URLRequest* request) {
 
 ChromeNetworkDelegate::ChromeNetworkDelegate(
     extensions::EventRouterForwarder* event_router,
-    BooleanPrefMember* enable_referrers)
+    BooleanPrefMember* enable_referrers,
+    metrics::UpdateUsagePrefCallbackType metrics_data_use_forwarder)
     : profile_(NULL),
       enable_referrers_(enable_referrers),
       enable_do_not_track_(NULL),
@@ -295,13 +296,16 @@ ChromeNetworkDelegate::ChromeNetworkDelegate(
       url_blacklist_manager_(NULL),
       domain_reliability_monitor_(NULL),
       experimental_web_platform_features_enabled_(
-          base::CommandLine::ForCurrentProcess()
-              ->HasSwitch(switches::kEnableExperimentalWebPlatformFeatures)),
+          base::CommandLine::ForCurrentProcess()->HasSwitch(
+              switches::kEnableExperimentalWebPlatformFeatures)),
       data_use_aggregator_(nullptr),
       is_data_usage_off_the_record_(true) {
   DCHECK(enable_referrers);
   extensions_delegate_.reset(
       ChromeExtensionsNetworkDelegate::Create(event_router));
+
+  // Pass callback for updating data use prefs to |DataUseMeasurement|  object.
+  data_use_measurement_.SetMetricsDataUseForwarder(metrics_data_use_forwarder);

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

Can this be a ctor param for that object instead of having a setter?

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

Done.

 }
 
 ChromeNetworkDelegate::~ChromeNetworkDelegate() {}