DocumentLoader::isCommittedButEmpty is timing-dependent.

Source/web/tests/DocumentLoaderTest.cpp

 // Copyright 2015 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 "config.h"
+#include "core/loader/DocumentLoader.h"
 
 #include "platform/testing/URLTestHelpers.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLLoaderClient.h"
 #include "public/platform/WebUnitTestSupport.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/tests/FrameTestHelpers.h"
 #include "wtf/TemporaryChange.h"
 #include <gtest/gtest.h>
 #include <queue>
@@ skipping 145 matching lines @@
     FrameTestHelpers::loadFrame(mainFrame(), "https://example.com/foo.html");
     Platform::current()->unitTestSupport()->setLoaderDelegate(nullptr);
 
     EXPECT_TRUE(delegate.servedReentrantly());
 
     // delegate is a WebFrameClient and stack-allocated, so manually reset() the
     // WebViewHelper here.
     m_webViewHelper.reset();
 }
 
+TEST_F(DocumentLoaderTest, isCommittedButEmpty)
+{
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    WebViewImpl* webViewImpl = webViewHelper.initializeAndLoad("about:blank", true);
+    EXPECT_TRUE(toLocalFrame(toCoreFrame(webViewImpl->mainFrame()))->loader().documentLoader()->isCommittedButEmpty());
+}
+
 } // namespace blink