Add timestamp to infobar for stale Previews

chrome/browser/previews/previews_infobar_delegate_unittest.cc

 // Copyright 2016 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 "chrome/browser/previews/previews_infobar_delegate.h"
 
 #include <memory>
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/feature_list.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
+#include "base/metrics/field_trial_params.h"
 #include "base/optional.h"
 #include "base/test/histogram_tester.h"
+#include "base/test/scoped_feature_list.h"
 #include "base/threading/thread_task_runner_handle.h"
+#include "base/time/time.h"
 #include "chrome/browser/android/android_theme_resources.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/loader/chrome_navigation_data.h"
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings.h"
 #include "chrome/browser/net/spdyproxy/data_reduction_proxy_chrome_settings_factory.h"
 #include "chrome/browser/previews/previews_infobar_tab_helper.h"
 #include "chrome/grit/generated_resources.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
+#include "chrome/test/base/testing_browser_process.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_config_test_utils.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_data.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_pingback_client.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_service.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_test_utils.h"
 #include "components/data_reduction_proxy/core/common/data_reduction_proxy_pref_names.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 #include "components/infobars/core/infobar.h"
 #include "components/infobars/core/infobar_delegate.h"
+#include "components/network_time/network_time_test_utils.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/previews/core/previews_experiments.h"
+#include "components/previews/core/previews_features.h"
 #include "components/proxy_config/proxy_config_pref_names.h"
+#include "components/variations/variations_associated_data.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/reload_type.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "content/public/common/referrer.h"
 #include "content/public/test/test_renderer_host.h"
 #include "content/public/test/web_contents_tester.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 56 matching lines @@
   content::ReloadType last_navigation_reload_type_;
   bool should_have_page_id_;
 };
 
 }  // namespace
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(TestPreviewsWebContentsObserver);
 
 class PreviewsInfoBarDelegateUnitTest : public ChromeRenderViewHostTestHarness {
  protected:
+  PreviewsInfoBarDelegateUnitTest()
+      : field_trial_list_(new base::FieldTrialList(nullptr)) {}
+
   void SetUp() override {
     ChromeRenderViewHostTestHarness::SetUp();
     InfoBarService::CreateForWebContents(web_contents());
     PreviewsInfoBarTabHelper::CreateForWebContents(web_contents());
     TestPreviewsWebContentsObserver::CreateForWebContents(web_contents());
 
     drp_test_context_ =
         data_reduction_proxy::DataReductionProxyTestContext::Builder()
             .WithMockConfig()
             .SkipSettingsInitialization()
             .Build();
 
     auto* data_reduction_proxy_settings =
         DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
             web_contents()->GetBrowserContext());
 
     PrefRegistrySimple* registry =
         drp_test_context_->pref_service()->registry();
     registry->RegisterDictionaryPref(proxy_config::prefs::kProxy);
     data_reduction_proxy_settings
         ->set_data_reduction_proxy_enabled_pref_name_for_test(
             drp_test_context_->GetDataReductionProxyEnabledPrefName());
     data_reduction_proxy_settings->InitDataReductionProxySettings(
         drp_test_context_->io_data(), drp_test_context_->pref_service(),
         drp_test_context_->request_context_getter(),
         base::WrapUnique(new data_reduction_proxy::DataStore()),
         base::ThreadTaskRunnerHandle::Get(),
         base::ThreadTaskRunnerHandle::Get());
+
+    TestingBrowserProcess::GetGlobal()->SetLocalState(
+        drp_test_context_->pref_service());
+    network_time::NetworkTimeTracker::RegisterPrefs(registry);
   }
 
   void TearDown() override {
     drp_test_context_->DestroySettings();
     ChromeRenderViewHostTestHarness::TearDown();
+    TestingBrowserProcess::GetGlobal()->SetLocalState(nullptr);
   }
 
-  ConfirmInfoBarDelegate* CreateInfoBar(previews::PreviewsType type,
-                                        bool is_data_saver_user) {
+  PreviewsInfoBarDelegate* CreateInfoBar(previews::PreviewsType type,
+                                         base::Time previews_freshness,
+                                         bool is_data_saver_user) {
     PreviewsInfoBarDelegate::Create(
-        web_contents(), type, is_data_saver_user,
+        web_contents(), type, previews_freshness, is_data_saver_user,
         base::Bind(&PreviewsInfoBarDelegateUnitTest::OnDismissPreviewsInfobar,
                    base::Unretained(this)));
 
     InfoBarService* infobar_service =
         InfoBarService::FromWebContents(web_contents());
     EXPECT_EQ(1U, infobar_service->infobar_count());
 
-    return infobar_service->infobar_at(0)
-        ->delegate()
-        ->AsConfirmInfoBarDelegate();
+    return static_cast<PreviewsInfoBarDelegate*>(
+        infobar_service->infobar_at(0)->delegate());
+  }
+
+  void EnableStalePreviewsTimestamp() {
+    const std::string kTrialName = "TrialName";
+    const std::string kGroupName = "GroupName";
+
+    std::map<std::string, std::string> variation_params;
+    variation_params["min_staleness_in_minutes"] = "2";
+    variation_params["max_staleness_in_minutes"] = "1440";
+
+    base::AssociateFieldTrialParams(kTrialName, kGroupName, variation_params);
+    base::FieldTrial* field_trial =
+        base::FieldTrialList::CreateFieldTrial(kTrialName, kGroupName);
+
+    std::unique_ptr<base::FeatureList> feature_list(new base::FeatureList);
+    feature_list->RegisterFieldTrialOverride(
+        previews::features::kStalePreviewsTimestamp.name,
+        base::FeatureList::OVERRIDE_ENABLE_FEATURE, field_trial);
+    scoped_feature_list_.InitWithFeatureList(std::move(feature_list));
   }
 
   void OnDismissPreviewsInfobar(bool user_opt_out) {
     user_opt_out_ = user_opt_out;
   }
 
   InfoBarService* infobar_service() {
     return InfoBarService::FromWebContents(web_contents());
   }
 
   std::unique_ptr<data_reduction_proxy::DataReductionProxyTestContext>
       drp_test_context_;
 
   base::Optional<bool> user_opt_out_;
+  std::unique_ptr<base::FieldTrialList> field_trial_list_;
+  base::test::ScopedFeatureList scoped_feature_list_;
 };
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, InfobarTestNavigationDismissal) {
   base::HistogramTester tester;
 
-  CreateInfoBar(previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+  CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                true /* is_data_saver_user */);
 
   // Try showing a second infobar. Another should not be shown since the page
   // has not navigated.
   PreviewsInfoBarDelegate::Create(
       web_contents(), previews::PreviewsType::LOFI,
-      true /* is_data_saver_user */,
+      base::Time() /* previews_freshness */, true /* is_data_saver_user */,
       PreviewsInfoBarDelegate::OnDismissPreviewsInfobarCallback());
   EXPECT_EQ(1U, infobar_service()->infobar_count());
 
   // Navigate and make sure the infobar is dismissed.
   NavigateAndCommit(GURL(kTestUrl));
   EXPECT_EQ(0U, infobar_service()->infobar_count());
   EXPECT_FALSE(user_opt_out_.value());
 
   tester.ExpectBucketCount(
       kUMAPreviewsInfoBarActionLoFi,
       PreviewsInfoBarDelegate::INFOBAR_DISMISSED_BY_NAVIGATION, 1);
   EXPECT_EQ(0, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiLoadImagesPerSession));
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, InfobarTestReloadDismissal) {
   base::HistogramTester tester;
 
   // Navigate to test URL, so we can reload later.
   NavigateAndCommit(GURL(kTestUrl));
 
-  CreateInfoBar(previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+  CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                true /* is_data_saver_user */);
 
   // Try showing a second infobar. Another should not be shown since the page
   // has not navigated.
   PreviewsInfoBarDelegate::Create(
       web_contents(), previews::PreviewsType::LOFI,
-      true /* is_data_saver_user */,
+      base::Time() /* previews_freshness */, true /* is_data_saver_user */,
       PreviewsInfoBarDelegate::OnDismissPreviewsInfobarCallback());
   EXPECT_EQ(1U, infobar_service()->infobar_count());
 
   // Navigate to test URL as a reload to dismiss the infobar.
   controller().LoadURL(GURL(kTestUrl), content::Referrer(),
                        ui::PAGE_TRANSITION_RELOAD, std::string());
   content::WebContentsTester::For(web_contents())->CommitPendingNavigation();
 
   EXPECT_EQ(0U, infobar_service()->infobar_count());
   EXPECT_FALSE(user_opt_out_.value());
 
   tester.ExpectBucketCount(kUMAPreviewsInfoBarActionLoFi,
                            PreviewsInfoBarDelegate::INFOBAR_DISMISSED_BY_RELOAD,
                            1);
   EXPECT_EQ(0, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiLoadImagesPerSession));
 
   auto* data_reduction_proxy_settings =
       DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
           web_contents()->GetBrowserContext());
 
   EXPECT_EQ(0u, data_reduction_proxy_settings->data_reduction_proxy_service()
                     ->pingback_client()
                     ->OptOutsSizeForTesting());
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, InfobarTestUserDismissal) {
   base::HistogramTester tester;
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+  ConfirmInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                    true /* is_data_saver_user */);
 
   // Simulate dismissing the infobar.
   infobar->InfoBarDismissed();
   infobar_service()->infobar_at(0)->RemoveSelf();
   EXPECT_EQ(0U, infobar_service()->infobar_count());
 
   tester.ExpectBucketCount(kUMAPreviewsInfoBarActionLoFi,
                            PreviewsInfoBarDelegate::INFOBAR_DISMISSED_BY_USER,
                            1);
   EXPECT_EQ(0, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiLoadImagesPerSession));
   EXPECT_FALSE(user_opt_out_.value());
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, InfobarTestTabClosedDismissal) {
   base::HistogramTester tester;
 
-  CreateInfoBar(previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+  CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                true /* is_data_saver_user */);
 
   // Delete the infobar without any other infobar actions.
   infobar_service()->infobar_at(0)->RemoveSelf();
   EXPECT_EQ(0U, infobar_service()->infobar_count());
 
   tester.ExpectBucketCount(
       kUMAPreviewsInfoBarActionLoFi,
       PreviewsInfoBarDelegate::INFOBAR_DISMISSED_BY_TAB_CLOSURE, 1);
   EXPECT_EQ(0, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiLoadImagesPerSession));
   EXPECT_FALSE(user_opt_out_.value());
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, InfobarTestClickLinkLoFi) {
   NavigateAndCommit(GURL(kTestUrl));
   const struct {
     bool using_previews_blacklist;
   } tests[] = {
       {true}, {false},
   };
   for (const auto test : tests) {
     drp_test_context_->config()->ResetLoFiStatusForTest();
-    base::FieldTrialList field_trial_list(nullptr);
+    field_trial_list_.reset();
+    field_trial_list_.reset(new base::FieldTrialList(nullptr));
     if (test.using_previews_blacklist) {
       base::FieldTrialList::CreateFieldTrial(
           "DataReductionProxyPreviewsBlackListTransition", "Enabled_");
     }
     base::HistogramTester tester;
     // Call Reload and CommitPendingNavigation to force DidFinishNavigation.
     web_contents()->GetController().Reload(content::ReloadType::NORMAL, true);
     content::WebContentsTester::For(web_contents())->CommitPendingNavigation();
 
-    ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-        previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+    ConfirmInfoBarDelegate* infobar =
+        CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                      true /* is_data_saver_user */);
 
     // Simulate clicking the infobar link.
     if (infobar->LinkClicked(WindowOpenDisposition::CURRENT_TAB))
       infobar_service()->infobar_at(0)->RemoveSelf();
     EXPECT_EQ(0U, infobar_service()->infobar_count());
 
     tester.ExpectBucketCount(
         kUMAPreviewsInfoBarActionLoFi,
         PreviewsInfoBarDelegate::INFOBAR_LOAD_ORIGINAL_CLICKED, 1);
     EXPECT_EQ(test.using_previews_blacklist ? 0 : 1,
               drp_test_context_->pref_service()->GetInteger(
                   data_reduction_proxy::prefs::kLoFiLoadImagesPerSession));
     EXPECT_TRUE(user_opt_out_.value());
 
     auto* data_reduction_proxy_settings =
         DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
             web_contents()->GetBrowserContext());
     EXPECT_EQ(1u, data_reduction_proxy_settings->data_reduction_proxy_service()
                       ->pingback_client()
                       ->OptOutsSizeForTesting());
   }
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, InfobarTestClickLinkLitePage) {
   base::HistogramTester tester;
 
   NavigateAndCommit(GURL(kTestUrl));
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::LITE_PAGE, true /* is_data_saver_user */);
+  ConfirmInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::LITE_PAGE, base::Time(),
+                    true /* is_data_saver_user */);
 
   // Simulate clicking the infobar link.
   if (infobar->LinkClicked(WindowOpenDisposition::CURRENT_TAB))
     infobar_service()->infobar_at(0)->RemoveSelf();
   EXPECT_EQ(0U, infobar_service()->infobar_count());
 
   tester.ExpectBucketCount(
       kUMAPreviewsInfoBarActionLitePage,
       PreviewsInfoBarDelegate::INFOBAR_LOAD_ORIGINAL_CLICKED, 1);
 
   content::WebContentsTester::For(web_contents())->CommitPendingNavigation();
 
   EXPECT_EQ(content::ReloadType::DISABLE_LOFI_MODE,
             TestPreviewsWebContentsObserver::FromWebContents(web_contents())
                 ->last_navigation_reload_type());
 
   auto* data_reduction_proxy_settings =
       DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
           web_contents()->GetBrowserContext());
 
   EXPECT_EQ(1u, data_reduction_proxy_settings->data_reduction_proxy_service()
                     ->pingback_client()
                     ->OptOutsSizeForTesting());
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, InfobarTestShownOncePerNavigation) {
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+  ConfirmInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                    true /* is_data_saver_user */);
 
   // Simulate dismissing the infobar.
   infobar->InfoBarDismissed();
   infobar_service()->infobar_at(0)->RemoveSelf();
   EXPECT_EQ(0U, infobar_service()->infobar_count());
 
   PreviewsInfoBarDelegate::Create(
       web_contents(), previews::PreviewsType::LOFI,
-      true /* is_data_saver_user */,
+      base::Time() /* previews_freshness */, true /* is_data_saver_user */,
       PreviewsInfoBarDelegate::OnDismissPreviewsInfobarCallback());
 
   // Infobar should not be shown again since a navigation hasn't happened.
   EXPECT_EQ(0U, infobar_service()->infobar_count());
 
   // Navigate and show infobar again.
   NavigateAndCommit(GURL(kTestUrl));
-  CreateInfoBar(previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+  CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                true /* is_data_saver_user */);
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, LoFiInfobarTest) {
   base::HistogramTester tester;
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::LOFI, true /* is_data_saver_user */);
+  ConfirmInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::LOFI, base::Time(),
+                    true /* is_data_saver_user */);
 
   tester.ExpectUniqueSample(kUMAPreviewsInfoBarActionLoFi,
                             PreviewsInfoBarDelegate::INFOBAR_SHOWN, 1);
   EXPECT_EQ(1, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiUIShownPerSession));
 
   ASSERT_TRUE(infobar);
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_SAVED_DATA_TITLE),
             infobar->GetMessageText());
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_LINK),
             infobar->GetLinkText());
 #if defined(OS_ANDROID)
   ASSERT_EQ(IDR_ANDROID_INFOBAR_PREVIEWS, infobar->GetIconId());
 #else
   ASSERT_EQ(PreviewsInfoBarDelegate::kNoIconID, infobar->GetIconId());
 #endif
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, PreviewInfobarTest) {
   base::HistogramTester tester;
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::LITE_PAGE, true /* is_data_saver_user */);
+  PreviewsInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::LITE_PAGE, base::Time(),
+                    true /* is_data_saver_user */);
 
   tester.ExpectUniqueSample(kUMAPreviewsInfoBarActionLitePage,
                             PreviewsInfoBarDelegate::INFOBAR_SHOWN, 1);
   EXPECT_EQ(1, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiUIShownPerSession));
 
   // Check the strings.
   ASSERT_TRUE(infobar);
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_SAVED_DATA_TITLE),
             infobar->GetMessageText());
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_LINK),
             infobar->GetLinkText());
+  ASSERT_EQ(base::string16(), infobar->GetTimestampText());
 #if defined(OS_ANDROID)
   ASSERT_EQ(IDR_ANDROID_INFOBAR_PREVIEWS, infobar->GetIconId());
 #else
   ASSERT_EQ(PreviewsInfoBarDelegate::kNoIconID, infobar->GetIconId());
 #endif
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, OfflineInfobarNonDataSaverUserTest) {
   base::HistogramTester tester;
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::OFFLINE, false /* is_data_saver_user */);
+  PreviewsInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::OFFLINE, base::Time(),
+                    false /* is_data_saver_user */);
 
   tester.ExpectUniqueSample(kUMAPreviewsInfoBarActionOffline,
                             PreviewsInfoBarDelegate::INFOBAR_SHOWN, 1);
   EXPECT_EQ(0, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiUIShownPerSession));
 
   // Check the strings.
   ASSERT_TRUE(infobar);
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_FASTER_PAGE_TITLE),
             infobar->GetMessageText());
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_LINK),
             infobar->GetLinkText());
+  ASSERT_EQ(base::string16(), infobar->GetTimestampText());
 #if defined(OS_ANDROID)
   ASSERT_EQ(IDR_ANDROID_INFOBAR_PREVIEWS, infobar->GetIconId());
 #else
   ASSERT_EQ(PreviewsInfoBarDelegate::kNoIconID, infobar->GetIconId());
 #endif
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, OfflineInfobarDataSaverUserTest) {
   base::HistogramTester tester;
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::OFFLINE, true /* is_data_saver_user */);
+  PreviewsInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::OFFLINE, base::Time(),
+                    true /* is_data_saver_user */);
 
   tester.ExpectUniqueSample(kUMAPreviewsInfoBarActionOffline,
                             PreviewsInfoBarDelegate::INFOBAR_SHOWN, 1);
   EXPECT_EQ(0, drp_test_context_->pref_service()->GetInteger(
                    data_reduction_proxy::prefs::kLoFiUIShownPerSession));
 
   // Check the strings.
   ASSERT_TRUE(infobar);
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_SAVED_DATA_TITLE),
             infobar->GetMessageText());
   ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_LINK),
             infobar->GetLinkText());
+  ASSERT_EQ(base::string16(), infobar->GetTimestampText());
 #if defined(OS_ANDROID)
   ASSERT_EQ(IDR_ANDROID_INFOBAR_PREVIEWS, infobar->GetIconId());
 #else
   ASSERT_EQ(PreviewsInfoBarDelegate::kNoIconID, infobar->GetIconId());
 #endif
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, OfflineInfobarDisablesLoFi) {
   base::HistogramTester tester;
 
   TestPreviewsWebContentsObserver::FromWebContents(web_contents())
       ->set_should_have_page_id(false);
 
   NavigateAndCommit(GURL(kTestUrl));
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::OFFLINE, true /* is_data_saver_user */);
+  ConfirmInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::OFFLINE, base::Time(),
+                    true /* is_data_saver_user */);
 
   tester.ExpectUniqueSample(kUMAPreviewsInfoBarActionOffline,
                             PreviewsInfoBarDelegate::INFOBAR_SHOWN, 1);
 
   // Simulate clicking the infobar link.
   if (infobar->LinkClicked(WindowOpenDisposition::CURRENT_TAB))
     infobar_service()->infobar_at(0)->RemoveSelf();
   EXPECT_EQ(0U, infobar_service()->infobar_count());
 
   content::WebContentsTester::For(web_contents())->CommitPendingNavigation();
 
   EXPECT_EQ(content::ReloadType::DISABLE_LOFI_MODE,
             TestPreviewsWebContentsObserver::FromWebContents(web_contents())
                 ->last_navigation_reload_type());
 
   auto* data_reduction_proxy_settings =
       DataReductionProxyChromeSettingsFactory::GetForBrowserContext(
           web_contents()->GetBrowserContext());
 
   EXPECT_EQ(0u, data_reduction_proxy_settings->data_reduction_proxy_service()
                     ->pingback_client()
                     ->OptOutsSizeForTesting());
 }
 
 TEST_F(PreviewsInfoBarDelegateUnitTest, PingbackClientClearedTabClosed) {
   base::HistogramTester tester;
 
   NavigateAndCommit(GURL(kTestUrl));
 
-  ConfirmInfoBarDelegate* infobar = CreateInfoBar(
-      previews::PreviewsType::LITE_PAGE, true /* is_data_saver_user */);
+  ConfirmInfoBarDelegate* infobar =
+      CreateInfoBar(previews::PreviewsType::LITE_PAGE, base::Time(),
+                    true /* is_data_saver_user */);
 
   // Simulate clicking the infobar link.
   if (infobar->LinkClicked(WindowOpenDisposition::CURRENT_TAB))
     infobar_service()->infobar_at(0)->RemoveSelf();
   EXPECT_EQ(0U, infobar_service()->infobar_count());
 
   tester.ExpectBucketCount(
       kUMAPreviewsInfoBarActionLitePage,
       PreviewsInfoBarDelegate::INFOBAR_LOAD_ORIGINAL_CLICKED, 1);
 
@@ skipping 22 matching lines @@
   EXPECT_EQ(1u, data_reduction_proxy_settings->data_reduction_proxy_service()
                     ->pingback_client()
                     ->OptOutsSizeForTesting());
 
   drp_test_context_->RunUntilIdle();
 
   EXPECT_EQ(0u, data_reduction_proxy_settings->data_reduction_proxy_service()
                     ->pingback_client()
                     ->OptOutsSizeForTesting());
 }
+
+TEST_F(PreviewsInfoBarDelegateUnitTest, PreviewInfobarTimestampMintuesTest) {
+  EnableStalePreviewsTimestamp();
+
+  int staleness_in_minutes = 5;
+
+  PreviewsInfoBarDelegate* infobar = CreateInfoBar(
+      previews::PreviewsType::LITE_PAGE,
+      base::Time::Now() - base::TimeDelta::FromMinutes(staleness_in_minutes),
+      true /* is_data_saver_user */);
+
+  ASSERT_EQ(
+      l10n_util::GetStringFUTF16(IDS_PREVIEWS_INFOBAR_TIMESTAMP_MINUTES,
+                                 base::IntToString16(staleness_in_minutes)),
+      infobar->GetTimestampText());

[tbansal1, 2017/06/19 20:52:29]

For my own understanding:
Should not infobar->GetTimestampText() also include the |message_text_|? If yes,
how are these two equal?

[megjablon, 2017/06/20 18:42:12]

No, GetTimestampText() only returns the timestamp since on Android this is added
in a separate view and shouldn't be shown with message_text_. See the cl linked
above and the bug for mocks.

+}
+
+TEST_F(PreviewsInfoBarDelegateUnitTest, PreviewInfobarTimestampHourTest) {
+  EnableStalePreviewsTimestamp();
+
+  int staleness_in_minutes = 65;
+
+  PreviewsInfoBarDelegate* infobar = CreateInfoBar(
+      previews::PreviewsType::LITE_PAGE,
+      base::Time::Now() - base::TimeDelta::FromMinutes(staleness_in_minutes),
+      true /* is_data_saver_user */);
+
+  ASSERT_EQ(l10n_util::GetStringUTF16(IDS_PREVIEWS_INFOBAR_TIMESTAMP_ONE_HOUR),
+            infobar->GetTimestampText());
+}
+
+TEST_F(PreviewsInfoBarDelegateUnitTest, PreviewInfobarTimestampHoursTest) {
+  EnableStalePreviewsTimestamp();
+
+  int staleness_in_hours = 2;
+
+  PreviewsInfoBarDelegate* infobar = CreateInfoBar(
+      previews::PreviewsType::LITE_PAGE,
+      base::Time::Now() - base::TimeDelta::FromHours(staleness_in_hours),
+      true /* is_data_saver_user */);
+
+  ASSERT_EQ(l10n_util::GetStringFUTF16(IDS_PREVIEWS_INFOBAR_TIMESTAMP_HOURS,
+                                       base::IntToString16(staleness_in_hours)),
+            infobar->GetTimestampText());
+}