markDocumentDirty() before styleResolverChanged().

third_party/WebKit/Source/core/dom/StyleEngineTest.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/dom/StyleEngine.h"
+
+#include "core/css/StyleSheetContents.h"
+#include "core/dom/Document.h"
+#include "core/frame/FrameView.h"
+#include "core/testing/DummyPageHolder.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+class StyleEngineTest : public ::testing::Test {
+protected:
+    void SetUp() override;
+
+    Document& document() { return m_dummyPageHolder->document(); }
+    StyleEngine& styleEngine() { return document().styleEngine(); }
+
+    bool isDocumentStyleSheetCollectionClean() { return !styleEngine().shouldUpdateDocumentStyleSheetCollection(AnalyzedStyleUpdate); }
+
+private:
+    OwnPtr<DummyPageHolder> m_dummyPageHolder;
+};
+
+void StyleEngineTest::SetUp()
+{
+    m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
+}
+
+TEST_F(StyleEngineTest, DocumentDirtyAfterInject)
+{
+    RefPtrWillBeRawPtr<StyleSheetContents> parsedSheet = StyleSheetContents::create(CSSParserContext(document(), nullptr));
+    parsedSheet->parseString("div {}");
+    styleEngine().injectAuthorSheet(parsedSheet);
+    document().view()->updateAllLifecyclePhases();
+
+    EXPECT_TRUE(isDocumentStyleSheetCollectionClean());
+}
+
+} // namespace blink