Tell IDB frontend about data loss

content/browser/indexed_db/indexed_db_backing_store.cc

Index: content/browser/indexed_db/indexed_db_backing_store.cc
diff --git a/content/browser/indexed_db/indexed_db_backing_store.cc b/content/browser/indexed_db/indexed_db_backing_store.cc
index e3b6a43369b235807614276dd7c349a372e01ed1..ecf43be64490aca34ddb411a85e1a7cc17b595d8 100644
--- a/content/browser/indexed_db/indexed_db_backing_store.cc
+++ b/content/browser/indexed_db/indexed_db_backing_store.cc
@@ -421,19 +421,26 @@ enum IndexedDBLevelDBBackingStoreOpenResult {
 scoped_refptr<IndexedDBBackingStore> IndexedDBBackingStore::Open(
     const string16& database_identifier,
     const base::FilePath& path_base,
-    const string16& file_identifier) {
+    const string16& file_identifier,
+    bool* data_loss) {
+  *data_loss = false;
   DefaultLevelDBFactory leveldb_factory;
-  return IndexedDBBackingStore::Open(
-      database_identifier, path_base, file_identifier, &leveldb_factory);
+  return IndexedDBBackingStore::Open(database_identifier,
+                                     path_base,
+                                     file_identifier,
+                                     data_loss,
+                                     &leveldb_factory);
 }
 
 scoped_refptr<IndexedDBBackingStore> IndexedDBBackingStore::Open(
     const string16& database_identifier,
     const base::FilePath& path_base,
     const string16& file_identifier,
+    bool* data_loss,
     LevelDBFactory* leveldb_factory) {
   IDB_TRACE("IndexedDBBackingStore::open");
   DCHECK(!path_base.empty());
+  *data_loss = false;
 
   scoped_ptr<LevelDBComparator> comparator(new Comparator());
   scoped_ptr<LevelDBDatabase> db;
@@ -549,6 +556,7 @@ scoped_refptr<IndexedDBBackingStore> IndexedDBBackingStore::Open(
     return scoped_refptr<IndexedDBBackingStore>();
   } else {
     LOG(ERROR) << "IndexedDB backing store open failed, attempting cleanup";
+    *data_loss = true;
     bool success = leveldb_factory->DestroyLevelDB(file_path);
     if (!success) {
       LOG(ERROR) << "IndexedDB backing store cleanup failed";