IndexedDB: Add --level-db flag, and pipe through to WebIDBFactory::open.

content/browser/in_process_webkit/indexed_db_dispatcher_host.cc

Index: content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
diff --git a/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc b/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
index b52f5f13eb9ba52fcf31cae546d95fc9a39b3527..698a6a2b47a72b19308daa7f0e193c2ea37fc8ad 100644
--- a/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
+++ b/content/browser/in_process_webkit/indexed_db_dispatcher_host.cc
@@ -240,10 +240,20 @@ void IndexedDBDispatcherHost::OnIDBFactoryOpen(
       quota = 1024 * 1024 * 1024; // 1GB. More or less "unlimited".
   }
 
+  WebKit::WebIDBFactory::BackingStoreImpl backingStoreImpl
+      = WebKit::WebIDBFactory::DefaultBackingStore;
+
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kLevelDBIndexedDatabase)) {
+    backingStoreImpl = WebKit::WebIDBFactory::LevelDBBackingStore;
+  }
+
+
   Context()->GetIDBFactory()->open(
       params.name,
       new IndexedDBCallbacks<WebIDBDatabase>(this, params.response_id), origin,
-      NULL, webkit_glue::FilePathToWebString(indexed_db_path), quota);
+      NULL, webkit_glue::FilePathToWebString(indexed_db_path), quota,
+      backingStoreImpl);
 }
 
 void IndexedDBDispatcherHost::OnIDBFactoryDeleteDatabase(