Mirror app list hierarchy data in profile prefs.

chrome/browser/ui/app_list/app_list_syncable_service.cc

Index: chrome/browser/ui/app_list/app_list_syncable_service.cc
diff --git a/chrome/browser/ui/app_list/app_list_syncable_service.cc b/chrome/browser/ui/app_list/app_list_syncable_service.cc
index f4d38d99435653204034badc8b1bda7df44e83f4..1cee4246acf247cc5ed76d6dd7a648b5f2a0bbef 100644
--- a/chrome/browser/ui/app_list/app_list_syncable_service.cc
+++ b/chrome/browser/ui/app_list/app_list_syncable_service.cc
@@ -9,6 +9,7 @@
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/ui/app_list/app_list_prefs.h"
 #include "chrome/browser/ui/app_list/app_list_service.h"
 #include "chrome/browser/ui/app_list/extension_app_item.h"
 #include "chrome/browser/ui/app_list/extension_app_model_builder.h"
@@ -203,6 +204,54 @@ class AppListSyncableService::ModelObserver : public AppListModelObserver {
   DISALLOW_COPY_AND_ASSIGN(ModelObserver);
 };
 
+// AppListSyncableService::PrefUpdater
+
+class AppListSyncableService::PrefUpdater : public AppListModelObserver {
+ public:
+  explicit PrefUpdater(AppListPrefs* app_list_prefs, AppListModel* model)
+      : app_list_prefs_(app_list_prefs), model_(model) {
+    model_->AddObserver(this);
+  }
+
+  virtual ~PrefUpdater() { model_->RemoveObserver(this); }
+
+ private:
+  void UpdatePrefsFromAppListItem(AppListItem* item) {
+    // Write synced data to local pref.
+    AppListPrefs::AppListInfo info;
+    if (item->GetItemType() == AppListFolderItem::kItemType)
+      info.item_type = AppListPrefs::AppListInfo::FOLDER_ITEM;
+    else if (item->GetItemType() == ExtensionAppItem::kItemType)
+      info.item_type = AppListPrefs::AppListInfo::APP_ITEM;
+    else
+      NOTREACHED();
+
+    info.parent_id = item->folder_id();
+    info.position = item->position();
+    info.name = item->name();
+
+    app_list_prefs_->SetAppListInfo(item->id(), info);
+  }
+
+  // Overridden from AppListModelObserver:
+  virtual void OnAppListItemAdded(AppListItem* item) OVERRIDE {
+    UpdatePrefsFromAppListItem(item);
+  }
+
+  virtual void OnAppListItemWillBeDeleted(AppListItem* item) OVERRIDE {
+    app_list_prefs_->DeleteAppListInfo(item->id());
+  }
+
+  virtual void OnAppListItemUpdated(AppListItem* item) OVERRIDE {
+    UpdatePrefsFromAppListItem(item);
+  }
+
+  AppListPrefs* app_list_prefs_;
+  AppListModel* model_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefUpdater);
+};
+
 // AppListSyncableService
 
 AppListSyncableService::AppListSyncableService(
@@ -264,6 +313,9 @@ void AppListSyncableService::BuildModel() {
     apps_builder_->InitializeWithProfile(profile_, model_.get());
   }
 
+  pref_updater_.reset(
+      new PrefUpdater(AppListPrefs::Get(profile_), model_.get()));
+
   if (app_list::switches::IsDriveAppsInAppListEnabled())
     drive_app_provider_.reset(new DriveAppProvider(profile_));
 }