Made ElementRareData store ComputedStyle on LayoutObject if possible.

third_party/WebKit/Source/core/dom/ElementRareDataTest.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/ElementRareData.h"
+
+#include "core/layout/LayoutInline.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+TEST(ElementRareDataTest, ComputedStyleStorage)
+{
+    // Without LayoutObject
+    ElementRareData* rareData = ElementRareData::create(nullptr);
+    RefPtr<ComputedStyle> style = ComputedStyle::create();
+    rareData->setComputedStyle(style);
+    EXPECT_EQ(style.get(), rareData->computedStyle());
+
+    // With LayoutObject
+    LayoutObject* layoutObject = new LayoutInline(nullptr);
+    rareData = ElementRareData::create(layoutObject);
+    rareData->setComputedStyle(style);
+    EXPECT_EQ(style.get(), rareData->computedStyle());
+
+    rareData->setLayoutObject(nullptr);
+    delete layoutObject;
+}
+
+} // namespace blink