Preload scan external CSS for @import

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"
+#include "core/html/parser/HTMLResourcePreloader.h"
+#include "core/testing/DummyPageHolder.h"
+#include "platform/heap/Heap.h"
+#include "platform/network/ResourceRequest.h"
+#include "platform/weborigin/KURL.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include <memory>
+
+namespace blink {
+
+class PreloadSuppressingCSSPreloaderResourceClient : public CSSPreloaderResourceClient {

[hiroshige, 2016/07/26 09:57:10]

Add |final|.

[Charlie Harrison, 2016/07/26 16:31:52]

Done.

+public:
+    PreloadSuppressingCSSPreloaderResourceClient(Resource* resource, HTMLResourcePreloader* preloader)
+        : CSSPreloaderResourceClient(resource, preloader) {}
+    void fetchPreloads(PreloadRequestStream& preloads) override
+    {
+        PreloadRequestStream movedPreloads;
+        movedPreloads.swap(preloads);
+        for (PreloadRequestStream::iterator it = movedPreloads.begin(); it != movedPreloads.end(); ++it) {
+            m_preloads.append(std::move(*it));
+        }
+    }
+
+    PreloadRequestStream m_preloads;
+};
+
+class CSSPreloadScannerTest : public ::testing::Test {
+};
+
+TEST_F(CSSPreloadScannerTest, ScanFromResourceClient)
+{
+    std::unique_ptr<DummyPageHolder> dummyPageHolder = DummyPageHolder::create(IntSize(500, 500));
+    dummyPageHolder->document().settings()->setCSSExternalScannerNoPreload(true);
+
+    HTMLResourcePreloader* preloader = HTMLResourcePreloader::create(dummyPageHolder->document());
+
+    KURL url(ParsedURLString, "http://127.0.0.1/foo.css");
+    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(1u, resourceClient->m_preloads.size());
+    EXPECT_EQ("http://127.0.0.1/preload.css", resourceClient->m_preloads.first()->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));
+    dummyPageHolder->document().settings()->setCSSExternalScannerNoPreload(true);
+
+    Persistent<HTMLResourcePreloader> preloader = HTMLResourcePreloader::create(dummyPageHolder->document());
+
+    KURL url(ParsedURLString, "http://127.0.0.1/foo.css");
+    Persistent<CSSStyleSheetResource> resource = CSSStyleSheetResource::createForTest(ResourceRequest(url), "utf-8");
+    resource->setStatus(Resource::Pending);
+
+    new PreloadSuppressingCSSPreloaderResourceClient(resource, preloader);
+
+    // Destroys the resourceClient.
+    ThreadHeap::collectAllGarbage();
+
+    const char* data = "@import url('http://127.0.0.1/preload.css');";
+    // Should not crash.
+    resource->appendData(data, strlen(data));
+}
+
+} // namespace blink