Implement local storage for App List in case app sync is off.

chrome/browser/sync/test/integration/single_client_app_list_sync_test.cc

Index: chrome/browser/sync/test/integration/single_client_app_list_sync_test.cc
diff --git a/chrome/browser/sync/test/integration/single_client_app_list_sync_test.cc b/chrome/browser/sync/test/integration/single_client_app_list_sync_test.cc
index 7edc917dcc242a81a746f017d56a2c95e44cd92c..11a0b5f7814041e87b7cb77c14ed2cfa301b315f 100644
--- a/chrome/browser/sync/test/integration/single_client_app_list_sync_test.cc
+++ b/chrome/browser/sync/test/integration/single_client_app_list_sync_test.cc
@@ -6,13 +6,17 @@
 
 #include "base/command_line.h"
 #include "base/macros.h"
+#include "base/run_loop.h"
+#include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/sync/test/integration/apps_helper.h"
+#include "chrome/browser/sync/test/integration/status_change_checker.h"
 #include "chrome/browser/sync/test/integration/sync_app_list_helper.h"
 #include "chrome/browser/sync/test/integration/sync_test.h"
 #include "chrome/browser/sync/test/integration/updated_progress_marker_checker.h"
 #include "chrome/browser/ui/app_list/app_list_syncable_service.h"
 #include "chrome/browser/ui/app_list/app_list_syncable_service_factory.h"
 #include "components/browser_sync/profile_sync_service.h"
+#include "extensions/browser/extension_system.h"
 #include "ui/app_list/app_list_switches.h"
 
 namespace {
@@ -23,6 +27,65 @@ bool AllProfilesHaveSameAppList() {
   return SyncAppListHelper::GetInstance()->AllProfilesHaveSameAppList();
 }
 
+// Returns true if sync items from |service1| match to sync items in |service2|.
+bool SyncItemsMatch(const app_list::AppListSyncableService* service1,
+                    const app_list::AppListSyncableService* service2) {
+  if (service1->sync_items().size() != service2->sync_items().size())
+    return false;
+
+  for (const auto& it : service1->sync_items()) {
+    const app_list::AppListSyncableService::SyncItem* item1 = it.second.get();
+    const app_list::AppListSyncableService::SyncItem* item2 =
+        service2->GetSyncItem(it.first);
+    if (!item2)
+      return false;
+    if (item1->item_id != item2->item_id ||
+        item1->item_type != item2->item_type ||
+        item1->item_name != item2->item_name ||
+        item1->parent_id != item2->parent_id ||
+        !item1->item_ordinal.EqualsOrBothInvalid(item2->item_ordinal) ||
+        !item1->item_pin_ordinal.EqualsOrBothInvalid(item2->item_pin_ordinal)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+class AppListSyncUpdateWaiter
+    : public StatusChangeChecker,
+      public app_list::AppListSyncableService::Observer {
+ public:
+  explicit AppListSyncUpdateWaiter(app_list::AppListSyncableService* service)
+      : service_(service) {
+    service_->AddObserverAndStart(this);
+  }
+
+  ~AppListSyncUpdateWaiter() override {
+    service_->RemoveObserver(this);
+  }
+
+  // StatusChangeChecker:
+  std::string GetDebugMessage() const override {
+    return "AwaitAppListSyncUpdated";
+  }
+
+  bool IsExitConditionSatisfied() override {
+    return service_updated_;
+  }
+
+  // app_list::AppListSyncableService::Observer:
+  void OnSyncModelUpdated() override {
+    service_updated_ = true;
+    StopWaiting();
+  }
+
+ private:
+  app_list::AppListSyncableService* const service_;
+  bool service_updated_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListSyncUpdateWaiter);
+};
+
 }  // namespace
 
 class SingleClientAppListSyncTest : public SyncTest {
@@ -73,3 +136,57 @@ IN_PROC_BROWSER_TEST_F(SingleClientAppListSyncTest, AppListSomeApps) {
   ASSERT_TRUE(UpdatedProgressMarkerChecker(GetSyncService(0)).Wait());
   ASSERT_TRUE(AllProfilesHaveSameAppList());
 }
+
+IN_PROC_BROWSER_TEST_F(SingleClientAppListSyncTest, LocalStorage) {
+  ASSERT_TRUE(SetupSync());
+
+  Profile* profile = GetProfile(0);
+  app_list::AppListSyncableService* service =
+      app_list::AppListSyncableServiceFactory::GetForProfile(profile);
+  browser_sync::ProfileSyncService* sync_service =
+      ProfileSyncServiceFactory::GetForProfile(profile);
+
+  const size_t kNumApps = 5;
+  syncer::StringOrdinal pin_position =
+      syncer::StringOrdinal::CreateInitialOrdinal();
+  std::vector<std::string> app_ids;
+  for (int i = 0; i < static_cast<int>(kNumApps); ++i) {
+    app_ids.push_back(apps_helper::InstallApp(profile, i));
+    service->SetPinPosition(app_ids.back(), pin_position);
+    pin_position = pin_position.CreateAfter();
+  }
+  SyncAppListHelper::GetInstance()->MoveAppToFolder(
+      profile, 2, "folder1");
+  SyncAppListHelper::GetInstance()->MoveAppToFolder(
+      profile, 3, "folder2");
+
+  app_list::AppListSyncableService compare_service(
+      profile, extensions::ExtensionSystem::Get(profile));
+
+  // Make sure that that on start, when sync has not been started yet, model
+  // content is filled from local prefs and it matches latest state.
+  EXPECT_TRUE(SyncItemsMatch(service, &compare_service));
+
+  ASSERT_TRUE(UpdatedProgressMarkerChecker(GetSyncService(0)).Wait());
+
+  // Disable app sync.
+  sync_service->OnUserChoseDatatypes(false, syncer::ModelTypeSet());
+
+  // Change data when sync is off.
+  for (const auto& app_id : app_ids) {
+    service->SetPinPosition(app_id, pin_position);
+    pin_position = pin_position.CreateAfter();
+  }
+  SyncAppListHelper::GetInstance()->MoveAppFromFolder(
+      profile, 0, "folder1");
+  SyncAppListHelper::GetInstance()->MoveAppFromFolder(
+      profile, 0, "folder2");
+  SyncAppListHelper::GetInstance()->MoveApp(profile, 0, 1);
+
+  EXPECT_FALSE(SyncItemsMatch(service, &compare_service));
+
+  // Restore sync and sync data should override local changes.
+  sync_service->OnUserChoseDatatypes(true, syncer::ModelTypeSet());
+  EXPECT_TRUE(AppListSyncUpdateWaiter(service).Wait());
+  EXPECT_TRUE(SyncItemsMatch(service, &compare_service));
+}