Ensure CSS scanner does not mark preloads as referenced

third_party/WebKit/Source/core/html/parser/CSSPreloadScannerTest.cpp

 // Copyright 2016 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 "core/html/parser/CSSPreloadScanner.h"
 
 #include "core/fetch/FetchContext.h"
 #include "core/fetch/Resource.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/Settings.h"
@@ skipping 40 matching lines @@
   CSSStyleSheetResource* resource =
       CSSStyleSheetResource::createForTest(ResourceRequest(url), "utf-8");
   resource->setStatus(Resource::Pending);
 
   PreloadSuppressingCSSPreloaderResourceClient* resourceClient =
       new PreloadSuppressingCSSPreloaderResourceClient(resource, preloader);
 
   const char* data = "@import url('http://127.0.0.1/preload.css');";
   resource->appendData(data, strlen(data));
 
+  EXPECT_EQ(Resource::PreloadNotReferenced, resource->getPreloadResult());
   EXPECT_EQ(1u, resourceClient->m_preloads.size());
   EXPECT_EQ("http://127.0.0.1/preload.css",
             resourceClient->m_preloads.front()->resourceURL());
 }
 
 // Regression test for crbug.com/608310 where the client is destroyed but was
 // not removed from the resource's client list.
 TEST_F(CSSPreloadScannerTest, DestroyClientBeforeDataSent) {
   std::unique_ptr<DummyPageHolder> dummyPageHolder =
       DummyPageHolder::create(IntSize(500, 500));
@@ skipping 65 matching lines @@
 
   const char* data = "@import url('http://127.0.0.1/preload.css');";
   resource->appendData(data, strlen(data));
 
   EXPECT_EQ(1u, resourceClient->m_preloads.size());
   EXPECT_EQ("http://127.0.0.1/preload.css",
             resourceClient->m_preloads.front()->resourceURL());
 }
 
 }  // namespace blink