Distinguish null IDBKey (no value) and invalid IDBKey (value is not valid key)

content/browser/in_process_webkit/indexed_db_uitest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/test/test_timeouts.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "chrome/test/ui/ui_layout_test.h"
@@ skipping 18 matching lines @@
   void AddJSTestResources() {
     // Add other paths our tests require.
     FilePath js_dir = FilePath().
                       AppendASCII("fast").AppendASCII("js");
     AddResourceForLayoutTest(js_dir, FilePath().AppendASCII("resources"));
   }
 
   FilePath test_dir_;
 };
 
-TEST_F(IndexedDBUILayoutTest, DISABLED_LayoutTests) {
+TEST_F(IndexedDBUILayoutTest, LayoutTests) {
   const int port = kNoHttpPort;
   InitializeForLayoutTest(test_dir_, FilePath(), port);
   AddJSTestResources();
   for (size_t i = 0; i < arraysize(kLayoutTestFileNames); ++i)
     RunLayoutTest(kLayoutTestFileNames[i], port);
 }