[ios][PhishGuard] Compile password reuse detection code in password_store

Design doc: go/bling-phishguard

This CL continues work to compile code in iOS that was previously
disabled behind PASSWORD_REUSE_DETECTION_ENABLED.

Runtime changes are put behind a feature flag.

Bug: 1147962
Change-Id: I4cd821e3bf80dbd6a68d393dfb16510d11e78940
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537916Reviewed-by: Ali Juma <ajuma@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827802}

components/password_manager/core/browser/password_store.cc

@@ -12,12 +12,14 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/debug/dump_without_crashing.h"
+#include "base/feature_list.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_functions.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
+#include "base/strings/string16.h"
 #include "base/task/post_task.h"
 #include "base/task/thread_pool.h"
 #include "base/task_runner_util.h"
@@ -34,20 +36,24 @@
 #include "components/password_manager/core/browser/password_manager_metrics_util.h"
 #include "components/password_manager/core/browser/password_manager_util.h"
 #include "components/password_manager/core/browser/password_store_consumer.h"
+#include "components/password_manager/core/browser/password_store_signin_notifier.h"
 #include "components/password_manager/core/browser/statistics_table.h"
 #include "components/password_manager/core/browser/sync/password_sync_bridge.h"
+#include "components/password_manager/core/common/password_manager_features.h"
 #include "components/password_manager/core/common/password_manager_pref_names.h"
 #include "components/prefs/pref_service.h"
+#include "components/safe_browsing/core/common/safe_browsing_prefs.h"
 #include "components/sync/model_impl/client_tag_based_model_type_processor.h"
 #include "components/sync/model_impl/proxy_model_type_controller_delegate.h"
-#include "base/strings/string16.h"
-#include "components/password_manager/core/browser/password_store_signin_notifier.h"
-#include "components/safe_browsing/core/common/safe_browsing_prefs.h"
 
 namespace password_manager {
 
 namespace {
 
+bool IsPasswordReuseDetectionEnabled() {
+  return base::FeatureList::IsEnabled(features::kPasswordReuseDetectionEnabled);
+}
+
 // Utility function to simplify removing logins prior a given |cutoff| data.
 // Runs |callback| with the result.
 //
@@ -156,9 +162,10 @@ bool PasswordStore::Init(PrefService* prefs,
   DCHECK(background_task_runner_);
   sync_enabled_or_disabled_cb_ = std::move(sync_enabled_or_disabled_cb);
   prefs_ = prefs;
-#if defined(PASSWORD_REUSE_DETECTION_ENABLED)
+
+  if (IsPasswordReuseDetectionEnabled()) {
     hash_password_manager_.set_prefs(prefs);
-#endif
+  }
   if (background_task_runner_) {
     TRACE_EVENT_NESTABLE_ASYNC_BEGIN0(
         "passwords", "PasswordStore::InitOnBackgroundSequence", this);
@@ -339,8 +346,7 @@ void PasswordStore::ReportMetrics(const std::string& sync_username,
                                              base::TimeDelta::FromSeconds(30));
   }
 
-#if defined(PASSWORD_REUSE_DETECTION_ENABLED)
-  if (!sync_username.empty()) {
+  if (IsPasswordReuseDetectionEnabled() && !sync_username.empty()) {
     auto hash_password_state =
         hash_password_manager_.HasPasswordHash(sync_username,
                                                /*is_gaia_password=*/true)
@@ -349,7 +355,6 @@ void PasswordStore::ReportMetrics(const std::string& sync_username,
     metrics_util::LogIsSyncPasswordHashSaved(hash_password_state,
                                              is_under_advanced_protection);
   }
-#endif
 }
 
 void PasswordStore::AddSiteStats(const InteractionsStats& stats) {
@@ -515,10 +520,8 @@ void PasswordStore::ShutdownOnUIThread() {
   // The AffiliationService must be destroyed from the main sequence.
   affiliated_match_helper_.reset();
   shutdown_called_ = true;
-#if defined(PASSWORD_REUSE_DETECTION_ENABLED)
   if (notifier_)
     notifier_->UnsubscribeFromSigninEvents();
-#endif
 }
 
 std::unique_ptr<syncer::ProxyModelTypeControllerDelegate>
@@ -689,7 +692,7 @@ bool PasswordStore::InitOnBackgroundSequence() {
           syncer::PASSWORDS, base::DoNothing()),
       /*password_store_sync=*/this, sync_enabled_or_disabled_cb_));
 
-#if defined(PASSWORD_REUSE_DETECTION_ENABLED)
+  if (IsPasswordReuseDetectionEnabled()) {
     reuse_detector_ = new PasswordReuseDetector;
 
     base::SequencedTaskRunnerHandle::Get()->PostTask(
@@ -697,7 +700,7 @@ bool PasswordStore::InitOnBackgroundSequence() {
         base::BindOnce(&PasswordStoreConsumer::OnGetPasswordStoreResultsFrom,
                        reuse_detector_->GetWeakPtr(), base::RetainedRef(this),
                        GetAutofillableLoginsImpl()));
-#endif
+  }
   return true;
 }
 
@@ -744,10 +747,9 @@ void PasswordStore::NotifyLoginsChanged(
     if (sync_bridge_)
       sync_bridge_->ActOnPasswordStoreChanges(changes);
 
-#if defined(PASSWORD_REUSE_DETECTION_ENABLED)
     if (reuse_detector_)
       reuse_detector_->OnLoginsChanged(changes);
-#endif
+
     ProcessLoginsChanged(
         changes,
         base::BindRepeating(
@@ -1373,10 +1375,8 @@ void PasswordStore::DestroyOnBackgroundSequence() {
   DCHECK(background_task_runner_->RunsTasksInCurrentSequence());
   sync_bridge_.reset();
 
-#if defined(PASSWORD_REUSE_DETECTION_ENABLED)
   delete reuse_detector_;
   reuse_detector_ = nullptr;
-#endif
 }
 
 }  // namespace password_manager

components/password_manager/core/browser/password_store_unittest.cc

@@ -137,6 +137,9 @@ class PasswordStoreTest : public testing::Test {
     // Mock OSCrypt. There is a call to OSCrypt on initializling
     // PasswordReuseDetector, so it should be mocked.
     OSCryptMocker::SetUp();
+
+    feature_list_.InitAndEnableFeature(
+        features::kPasswordReuseDetectionEnabled);
   }
 
   void TearDown() override { OSCryptMocker::TearDown(); }
@@ -156,6 +159,7 @@ class PasswordStoreTest : public testing::Test {
   base::ScopedTempDir temp_dir_;
   base::test::TaskEnvironment task_environment_{
       base::test::TaskEnvironment::MainThreadType::UI};
+  base::test::ScopedFeatureList feature_list_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordStoreTest);
 };
@@ -1179,7 +1183,6 @@ TEST_F(PasswordStoreTest, Unblacklisting) {
   store->ShutdownOnUIThread();
 }
 
-#if defined(PASSWORD_REUSE_DETECTION_ENABLED)
 TEST_F(PasswordStoreTest, CheckPasswordReuse) {
   static constexpr PasswordFormData kTestCredentials[] = {
       {PasswordForm::Scheme::kHtml, "https://www.google.com",
@@ -1460,7 +1463,6 @@ TEST_F(PasswordStoreTest, ReportMetricsForNonSyncPassword) {
       GaiaPasswordHashChange::NOT_SYNC_PASSWORD_CHANGE, 1);
   store->ShutdownOnUIThread();
 }
-#endif
 
 TEST_F(PasswordStoreTest, GetAllCompromisedCredentials) {
   base::test::ScopedFeatureList feature_list;