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

content/browser/in_process_webkit/indexed_db_browsertest.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/bind.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/scoped_temp_dir.h"
@@ skipping 42 matching lines @@
     if (result != "pass") {
       std::string js_result;
       ASSERT_TRUE(ui_test_utils::ExecuteJavaScriptAndExtractString(
           the_browser->GetSelectedWebContents()->GetRenderViewHost(), L"",
           L"window.domAutomationController.send(getLog())", &js_result));
       FAIL() << "Failed: " << js_result;
     }
   }
 };
 
-// TODO(jsbell): Disabled to land WK76487; http://crbug.com/110956 has fix.
-IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, DISABLED_CursorTest) {
+IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, CursorTest) {
   SimpleTest(testUrl(FilePath(FILE_PATH_LITERAL("cursor_test.html"))));
 }
 
-// TODO(jsbell): Disabled to land WK76487; http://crbug.com/110956 has fix.
-IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, DISABLED_CursorTestIncognito) {
+IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, CursorTestIncognito) {
   SimpleTest(testUrl(FilePath(FILE_PATH_LITERAL("cursor_test.html"))),
              true /* incognito */);
 }
 
-// TODO(jsbell): Disabled to land WK76487; http://crbug.com/110956 has fix.
-IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, DISABLED_CursorPrefetch) {
+IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, CursorPrefetch) {
   SimpleTest(testUrl(FilePath(FILE_PATH_LITERAL("cursor_prefetch.html"))));
 }
 
 // Flaky: http://crbug.com/70773
 IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, DISABLED_IndexTest) {
   SimpleTest(testUrl(FilePath(FILE_PATH_LITERAL("index_test.html"))));
 }
 
 // Flaky: http://crbug.com/70773
 IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, DISABLED_KeyPathTest) {
@@ skipping 240 matching lines @@
   virtual void SetUpCommandLine(CommandLine* command_line) {
     command_line->AppendSwitchASCII(switches::kJavaScriptFlags, "--expose-gc");
   }
 };
 
 IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTestWithGCExposed,
                        DatabaseCallbacksTest) {
   SimpleTest(
       testUrl(FilePath(FILE_PATH_LITERAL("database_callbacks_first.html"))));
 }