Set ComputedStyle on Node and use that in buildOwnLayout()

third_party/WebKit/Source/core/dom/NodeComputedStyle.h

Index: third_party/WebKit/Source/core/dom/NodeComputedStyle.h
diff --git a/third_party/WebKit/Source/core/dom/NodeComputedStyle.h b/third_party/WebKit/Source/core/dom/NodeComputedStyle.h
index 4d7e9d6db263d9ab79aa80a8c2cc1f26f26cf6b5..07663500c0e3022a58e10055e2858cb4f2b7636b 100644
--- a/third_party/WebKit/Source/core/dom/NodeComputedStyle.h
+++ b/third_party/WebKit/Source/core/dom/NodeComputedStyle.h
@@ -58,6 +58,27 @@ inline ComputedStyle* Node::mutableComputedStyle() const
     return m_data.m_computedStyle;
 }
 
+inline void Node::setComputedStyle(PassRefPtr<ComputedStyle> computedStyle)
+{
+    if (hasRareData()) {
+        if (hasLayoutObject()) {
+            m_data.m_rareData->layoutObject()->setStyleInternal(computedStyle);
+        } else {
+            NodeRareData* rareData = this->rareData();
+            DCHECK(rareData->isElementRareData());
+            static_cast<ElementRareData*>(rareData)->setComputedStyle(computedStyle);
+        }
+    } else {
+        if (hasLayoutObject()) {
+            m_data.m_layoutObject->setStyleInternal(computedStyle);
+        } else {
+            if (m_data.m_computedStyle)
+                m_data.m_computedStyle->deref();
+            m_data.m_computedStyle = computedStyle.leakRef();
+        }
+    }
+}
+
 inline const ComputedStyle* Node::parentComputedStyle() const
 {
     if (isSlotOrActiveInsertionPoint())