Update data reduction proxy statistics prefs less often on desktop

components/data_reduction_proxy/browser/data_reduction_proxy_metrics_unittest.cc

 // Copyright 2014 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 "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
-#include "base/prefs/scoped_user_pref_update.h"
 #include "base/prefs/testing_pref_service.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/test/test_simple_task_runner.h"
+#include "base/time/time.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_metrics.h"
+#include "components/data_reduction_proxy/browser/data_reduction_proxy_statistics_prefs.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_pref_names.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 const size_t kNumDaysInHistory = 60;
 
 int64 GetListPrefInt64Value(
     const base::ListValue& list_update, size_t index) {
   std::string string_value;
   EXPECT_TRUE(list_update.GetString(index, &string_value));
 
   int64 value = 0;
   EXPECT_TRUE(base::StringToInt64(string_value, &value));
   return value;
 }
 
 }  // namespace
 
 namespace data_reduction_proxy {
 
 // Test UpdateContentLengthPrefs.
 class ChromeNetworkDataSavingMetricsTest : public testing::Test {
  protected:
   ChromeNetworkDataSavingMetricsTest() {}
 
   virtual void SetUp() OVERRIDE {
+    statistics_prefs_.reset(new DataReductionProxyStatisticsPrefs(
+        &pref_service_,
+        scoped_refptr<base::TestSimpleTaskRunner>(
+            new base::TestSimpleTaskRunner()),
+        base::TimeDelta()));
     PrefRegistrySimple* registry = pref_service_.registry();
     registry->RegisterInt64Pref(
         data_reduction_proxy::prefs::kHttpReceivedContentLength, 0);
     registry->RegisterInt64Pref(
         data_reduction_proxy::prefs::kHttpOriginalContentLength, 0);
 
     registry->RegisterListPref(data_reduction_proxy::prefs::
                                    kDailyHttpOriginalContentLength);
     registry->RegisterListPref(data_reduction_proxy::prefs::
                                    kDailyHttpReceivedContentLength);
@@ skipping 20 matching lines @@
             kDailyOriginalContentLengthViaDataReductionProxy);
     registry->RegisterListPref(
         data_reduction_proxy::prefs::
             kDailyContentLengthViaDataReductionProxy);
     registry->RegisterInt64Pref(
         data_reduction_proxy::prefs::
             kDailyHttpContentLengthLastUpdateDate, 0L);
   }
 
   TestingPrefServiceSimple pref_service_;
+  scoped_ptr<DataReductionProxyStatisticsPrefs> statistics_prefs_;
 };
 
 TEST_F(ChromeNetworkDataSavingMetricsTest, TotalLengths) {
   const int64 kOriginalLength = 200;
   const int64 kReceivedLength = 100;
 
   UpdateContentLengthPrefs(
       kReceivedLength, kOriginalLength,
-      false, UNKNOWN_TYPE, &pref_service_);
+      false, UNKNOWN_TYPE, statistics_prefs_.get());
   EXPECT_EQ(kReceivedLength,
-            pref_service_.GetInt64(
+            statistics_prefs_->GetInt64(
                 data_reduction_proxy::prefs::kHttpReceivedContentLength));
   EXPECT_EQ(kOriginalLength,
-            pref_service_.GetInt64(
+            statistics_prefs_->GetInt64(
                 data_reduction_proxy::prefs::kHttpOriginalContentLength));
 
-  // Record the same numbers again, and total lengths should be dobuled.
+  // Record the same numbers again, and total lengths should be doubled.
   UpdateContentLengthPrefs(
       kReceivedLength, kOriginalLength,
-      false, UNKNOWN_TYPE, &pref_service_);
+      false, UNKNOWN_TYPE, statistics_prefs_.get());
   EXPECT_EQ(kReceivedLength * 2,
-            pref_service_.GetInt64(
+            statistics_prefs_->GetInt64(
                 data_reduction_proxy::prefs::kHttpReceivedContentLength));
   EXPECT_EQ(kOriginalLength * 2,
-            pref_service_.GetInt64(
+            statistics_prefs_->GetInt64(
                 data_reduction_proxy::prefs::kHttpOriginalContentLength));
 }
 
 // The initial last update time used in test. There is no leap second a few
 // days around this time used in the test.
 // Note: No time zone is specified. Local time will be assumed by
 // base::Time::FromString below.
 const char kLastUpdateTime[] = "Wed, 18 Sep 2013 03:45:26";
 
 class ChromeNetworkDailyDataSavingMetricsTest
@@ skipping 20 matching lines @@
   void SetFakeTimeDeltaInHours(int hours) {
     now_delta_ = base::TimeDelta::FromHours(hours);
   }
 
   void AddFakeTimeDeltaInHours(int hours) {
     now_delta_ += base::TimeDelta::FromHours(hours);
   }
 
   // Create daily pref list of |kNumDaysInHistory| zero values.
   void CreatePrefList(const char* pref) {
-    ListPrefUpdate update(&pref_service_, pref);
+    base::ListValue* update = statistics_prefs_->GetList(pref);
     update->Clear();
     for (size_t i = 0; i < kNumDaysInHistory; ++i) {
       update->Insert(0, new base::StringValue(base::Int64ToString(0)));
     }
   }
 
   // Verify the pref list values are equal to the given values.
   // If the count of values is less than kNumDaysInHistory, zeros are assumed
   // at the beginning.
   void VerifyPrefList(const char* pref, const int64* values, size_t count) {
     ASSERT_GE(kNumDaysInHistory, count);
-    ListPrefUpdate update(&pref_service_, pref);
+    base::ListValue* update = statistics_prefs_->GetList(pref);
     ASSERT_EQ(kNumDaysInHistory, update->GetSize()) << "Pref: " << pref;
 
     for (size_t i = 0; i < count; ++i) {
       EXPECT_EQ(
           values[i],
           GetListPrefInt64Value(*update, kNumDaysInHistory - count + i))
           << "index=" << (kNumDaysInHistory - count + i);
     }
     for (size_t i = 0; i < kNumDaysInHistory - count; ++i) {
       EXPECT_EQ(0, GetListPrefInt64Value(*update, i)) << "index=" << i;
@@ skipping 97 matching lines @@
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, OneResponse) {
   const int64 kOriginalLength = 200;
   const int64 kReceivedLength = 100;
   int64 original[] = {kOriginalLength};
   int64 received[] = {kReceivedLength};
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       original, 1, received, 1,
       original, 1, received, 1);
 }
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, MultipleResponses) {
   const int64 kOriginalLength = 150;
   const int64 kReceivedLength = 100;
   int64 original[] = {kOriginalLength};
   int64 received[] = {kReceivedLength};
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       false, UNKNOWN_TYPE,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       NULL, 0, NULL, 0, NULL, 0, NULL, 0);
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, UNKNOWN_TYPE,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   original[0] += kOriginalLength;
   received[0] += kReceivedLength;
   int64 original_proxy_enabled[] = {kOriginalLength};
   int64 received_proxy_enabled[] = {kReceivedLength};
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       original_proxy_enabled, 1, received_proxy_enabled, 1,
       NULL, 0, NULL, 0);
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   original[0] += kOriginalLength;
   received[0] += kReceivedLength;
   original_proxy_enabled[0] += kOriginalLength;
   received_proxy_enabled[0] += kReceivedLength;
   int64 original_via_proxy[] = {kOriginalLength};
   int64 received_via_proxy[] = {kReceivedLength};
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       original_proxy_enabled, 1, received_proxy_enabled, 1,
       original_via_proxy, 1, received_via_proxy, 1);
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
-      true, UNKNOWN_TYPE, FakeNow(), &pref_service_);
+      true, UNKNOWN_TYPE, FakeNow(), statistics_prefs_.get());
   original[0] += kOriginalLength;
   received[0] += kReceivedLength;
   original_proxy_enabled[0] += kOriginalLength;
   received_proxy_enabled[0] += kReceivedLength;
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       original_proxy_enabled, 1, received_proxy_enabled, 1,
       original_via_proxy, 1, received_via_proxy, 1);
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
-      false, UNKNOWN_TYPE, FakeNow(), &pref_service_);
+      false, UNKNOWN_TYPE, FakeNow(), statistics_prefs_.get());
   original[0] += kOriginalLength;
   received[0] += kReceivedLength;
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       original_proxy_enabled, 1, received_proxy_enabled, 1,
       original_via_proxy, 1, received_via_proxy, 1);
 }
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, RequestType) {
   const int64 kContentLength = 200;
   int64 received[] = {0};
   int64 https_received[] = {0};
   int64 total_received[] = {0};
   int64 proxy_enabled_received[] = {0};
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kContentLength, kContentLength,
       true, HTTPS,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   total_received[0] += kContentLength;
   proxy_enabled_received[0] += kContentLength;
   https_received[0] += kContentLength;
   VerifyDailyRequestTypeContentLengthPrefLists(
       total_received, 1, total_received, 1,
       proxy_enabled_received, 1, proxy_enabled_received, 1,
       https_received, 1,
       received, 0,  // short bypass
       received, 0,  // long bypass
       received, 0);  // unknown
 
   // Data reduction proxy is not enabled.
   UpdateContentLengthPrefsForDataReductionProxy(
       kContentLength, kContentLength,
       false, HTTPS,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   total_received[0] += kContentLength;
   VerifyDailyRequestTypeContentLengthPrefLists(
       total_received, 1, total_received, 1,
       proxy_enabled_received, 1, proxy_enabled_received, 1,
       https_received, 1,
       received, 0,  // short bypass
       received, 0,  // long bypass
       received, 0);  // unknown
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kContentLength, kContentLength,
       true, HTTPS,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   total_received[0] += kContentLength;
   proxy_enabled_received[0] += kContentLength;
   https_received[0] += kContentLength;
   VerifyDailyRequestTypeContentLengthPrefLists(
       total_received, 1, total_received, 1,
       proxy_enabled_received, 1, proxy_enabled_received, 1,
       https_received, 1,
       received, 0,  // short bypass
       received, 0,  // long bypass
       received, 0);  // unknown
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kContentLength, kContentLength,
       true, SHORT_BYPASS,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   total_received[0] += kContentLength;
   proxy_enabled_received[0] += kContentLength;
   received[0] += kContentLength;
   VerifyDailyRequestTypeContentLengthPrefLists(
       total_received, 1, total_received, 1,
       proxy_enabled_received, 1, proxy_enabled_received, 1,
       https_received, 1,
       received, 1,  // short bypass
       received, 0,  // long bypass
       received, 0);  // unknown
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kContentLength, kContentLength,
       true, LONG_BYPASS,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   total_received[0] += kContentLength;
   proxy_enabled_received[0] += kContentLength;
   VerifyDailyRequestTypeContentLengthPrefLists(
       total_received, 1, total_received, 1,  // total
       proxy_enabled_received, 1, proxy_enabled_received, 1,
       https_received, 1,
       received, 1,  // short bypass
       received, 1,  // long bypass
       received, 0);  // unknown
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kContentLength, kContentLength,
       true, UNKNOWN_TYPE,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   total_received[0] += kContentLength;
   proxy_enabled_received[0] += kContentLength;
   VerifyDailyRequestTypeContentLengthPrefLists(
       total_received, 1, total_received, 1,
       proxy_enabled_received, 1, proxy_enabled_received, 1,
       https_received, 1,
       received, 1,  // short bypass
       received, 1,  // long bypass
       received, 1);  // unknown
 }
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, ForwardOneDay) {
   const int64 kOriginalLength = 200;
   const int64 kReceivedLength = 100;
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
 
   // Forward one day.
   SetFakeTimeDeltaInHours(24);
 
   // Proxy not enabled. Not via proxy.
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
-      false, UNKNOWN_TYPE, FakeNow(), &pref_service_);
+      false, UNKNOWN_TYPE, FakeNow(), statistics_prefs_.get());
 
   int64 original[] = {kOriginalLength, kOriginalLength};
   int64 received[] = {kReceivedLength, kReceivedLength};
   int64 original_with_data_reduction_proxy_enabled[] = {kOriginalLength, 0};
   int64 received_with_data_reduction_proxy_enabled[] = {kReceivedLength, 0};
   int64 original_via_data_reduction_proxy[] = {kOriginalLength, 0};
   int64 received_via_data_reduction_proxy[] = {kReceivedLength, 0};
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 2,
       received, 2,
       original_with_data_reduction_proxy_enabled, 2,
       received_with_data_reduction_proxy_enabled, 2,
       original_via_data_reduction_proxy, 2,
       received_via_data_reduction_proxy, 2);
 
   // Proxy enabled. Not via proxy.
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
-      true, UNKNOWN_TYPE, FakeNow(), &pref_service_);
+      true, UNKNOWN_TYPE, FakeNow(), statistics_prefs_.get());
   original[1] += kOriginalLength;
   received[1] += kReceivedLength;
   original_with_data_reduction_proxy_enabled[1] += kOriginalLength;
   received_with_data_reduction_proxy_enabled[1] += kReceivedLength;
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 2,
       received, 2,
       original_with_data_reduction_proxy_enabled, 2,
       received_with_data_reduction_proxy_enabled, 2,
       original_via_data_reduction_proxy, 2,
       received_via_data_reduction_proxy, 2);
 
   // Proxy enabled and via proxy.
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   original[1] += kOriginalLength;
   received[1] += kReceivedLength;
   original_with_data_reduction_proxy_enabled[1] += kOriginalLength;
   received_with_data_reduction_proxy_enabled[1] += kReceivedLength;
   original_via_data_reduction_proxy[1] += kOriginalLength;
   received_via_data_reduction_proxy[1] += kReceivedLength;
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 2,
       received, 2,
       original_with_data_reduction_proxy_enabled, 2,
       received_with_data_reduction_proxy_enabled, 2,
       original_via_data_reduction_proxy, 2,
       received_via_data_reduction_proxy, 2);
 }
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, PartialDayTimeChange) {
   const int64 kOriginalLength = 200;
   const int64 kReceivedLength = 100;
   int64 original[] = {0, kOriginalLength};
   int64 received[] = {0, kReceivedLength};
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 2, received, 2,
       original, 2, received, 2,
       original, 2, received, 2);
 
   // Forward 10 hours, stay in the same day.
   // See kLastUpdateTime: "Now" in test is 03:45am.
   SetFakeTimeDeltaInHours(10);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   original[1] += kOriginalLength;
   received[1] += kReceivedLength;
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 2, received, 2,
       original, 2, received, 2,
       original, 2, received, 2);
 
   // Forward 11 more hours, comes to tomorrow.
   AddFakeTimeDeltaInHours(11);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   int64 original2[] = {kOriginalLength * 2, kOriginalLength};
   int64 received2[] = {kReceivedLength * 2, kReceivedLength};
   VerifyDailyDataSavingContentLengthPrefLists(
       original2, 2, received2, 2,
       original2, 2, received2, 2,
       original2, 2, received2, 2);
 }
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, ForwardMultipleDays) {
   const int64 kOriginalLength = 200;
   const int64 kReceivedLength = 100;
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
 
   // Forward three days.
   SetFakeTimeDeltaInHours(3 * 24);
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
 
   int64 original[] = {kOriginalLength, 0, 0, kOriginalLength};
   int64 received[] = {kReceivedLength, 0, 0, kReceivedLength};
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 4, received, 4,
       original, 4, received, 4,
       original, 4, received, 4);
 
   // Forward four more days.
   AddFakeTimeDeltaInHours(4 * 24);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   int64 original2[] = {
     kOriginalLength, 0, 0, kOriginalLength, 0, 0, 0, kOriginalLength,
   };
   int64 received2[] = {
     kReceivedLength, 0, 0, kReceivedLength, 0, 0, 0, kReceivedLength,
   };
   VerifyDailyDataSavingContentLengthPrefLists(
       original2, 8, received2, 8,
       original2, 8, received2, 8,
       original2, 8, received2, 8);
 
   // Forward |kNumDaysInHistory| more days.
   AddFakeTimeDeltaInHours(kNumDaysInHistory * 24);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   int64 original3[] = {kOriginalLength};
   int64 received3[] = {kReceivedLength};
   VerifyDailyDataSavingContentLengthPrefLists(
       original3, 1, received3, 1,
       original3, 1, received3, 1,
       original3, 1, received3, 1);
 
   // Forward |kNumDaysInHistory| + 1 more days.
   AddFakeTimeDeltaInHours((kNumDaysInHistory + 1)* 24);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   VerifyDailyDataSavingContentLengthPrefLists(
       original3, 1, received3, 1,
       original3, 1, received3, 1,
       original3, 1, received3, 1);
 }
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, BackwardAndForwardOneDay) {
   const int64 kOriginalLength = 200;
   const int64 kReceivedLength = 100;
   int64 original[] = {kOriginalLength};
   int64 received[] = {kReceivedLength};
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
 
   // Backward one day.
   SetFakeTimeDeltaInHours(-24);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   original[0] += kOriginalLength;
   received[0] += kReceivedLength;
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       original, 1, received, 1,
       original, 1, received, 1);
 
   // Then, Forward one day
   AddFakeTimeDeltaInHours(24);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   int64 original2[] = {kOriginalLength * 2, kOriginalLength};
   int64 received2[] = {kReceivedLength * 2, kReceivedLength};
   VerifyDailyDataSavingContentLengthPrefLists(
       original2, 2, received2, 2,
       original2, 2, received2, 2,
       original2, 2, received2, 2);
 }
 
 TEST_F(ChromeNetworkDailyDataSavingMetricsTest, BackwardTwoDays) {
   const int64 kOriginalLength = 200;
   const int64 kReceivedLength = 100;
   int64 original[] = {kOriginalLength};
   int64 received[] = {kReceivedLength};
 
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   // Backward two days.
   SetFakeTimeDeltaInHours(-2 * 24);
   UpdateContentLengthPrefsForDataReductionProxy(
       kReceivedLength, kOriginalLength,
       true, VIA_DATA_REDUCTION_PROXY,
-      FakeNow(), &pref_service_);
+      FakeNow(), statistics_prefs_.get());
   VerifyDailyDataSavingContentLengthPrefLists(
       original, 1, received, 1,
       original, 1, received, 1,
       original, 1, received, 1);
 }
 
 }  // namespace data_reduction_proxy