Update data reduction proxy statistics prefs less often on desktop

components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc

Index: components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
index ccd3c2dd2b4211d804a2e2053456120998a8b854..128c64de56d6cb64aeb9f2da919bb6be35f9948c 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_settings_test_utils.cc
@@ -10,6 +10,8 @@
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/test/test_simple_task_runner.h"
+#include "components/data_reduction_proxy/browser/data_reduction_proxy_delayed_pref_service.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_pref_names.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_switches.h"
 
@@ -83,6 +85,11 @@ DataReductionProxySettingsTestBase::~DataReductionProxySettingsTestBase() {}
 
 // testing::Test implementation:
 void DataReductionProxySettingsTestBase::SetUp() {
+  delayed_pref_service_ = new DataReductionProxyDelayedPrefService(
+      &pref_service_,
+      scoped_refptr<base::TestSimpleTaskRunner>(
+          new base::TestSimpleTaskRunner()),
+          base::TimeDelta());
   PrefRegistrySimple* registry = pref_service_.registry();
   registry->RegisterListPref(prefs::kDailyHttpOriginalContentLength);
   registry->RegisterListPref(prefs::kDailyHttpReceivedContentLength);
@@ -106,7 +113,7 @@ void DataReductionProxySettingsTestBase::SetUp() {
     received_update->Insert(0, new base::StringValue(base::Int64ToString(i)));
   }
   last_update_time_ = base::Time::Now().LocalMidnight();
-  pref_service_.SetInt64(
+  delayed_pref_service_->SetInt64(
       prefs::kDailyHttpContentLengthLastUpdateDate,
       last_update_time_.ToInternalValue());
   expected_params_.reset(new TestDataReductionProxyParams(
@@ -146,6 +153,8 @@ void DataReductionProxySettingsTestBase::ResetSettings(bool allowed,
   EXPECT_CALL(*settings, GetURLFetcherForWarmup()).Times(0);
   EXPECT_CALL(*settings, LogProxyState(_, _, _)).Times(0);
   settings_.reset(settings);
+  settings_->SetDataReductionProxyDelayedPrefService(
+      delayed_pref_service_->AsWeakPtr());
   settings_->configurator_.reset(new TestDataReductionProxyConfig());
 }
 
@@ -303,7 +312,6 @@ void DataReductionProxySettingsTestBase::CheckInitDataReductionProxy(
 
   settings_->InitDataReductionProxySettings(
       &pref_service_,
-      &pref_service_,
       request_context.get());
   settings_->SetOnDataReductionEnabledCallback(
       base::Bind(&DataReductionProxySettingsTestBase::