Support display: contents for elements, first-line and first-letter pseudos.

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

Index: third_party/WebKit/Source/core/dom/Element.h
diff --git a/third_party/WebKit/Source/core/dom/Element.h b/third_party/WebKit/Source/core/dom/Element.h
index 6cb006f74da67e53312a88f35ce4854924bdc768..a5a355d5b75ec72f12f30d7dcf1bded230e0d581 100644
--- a/third_party/WebKit/Source/core/dom/Element.h
+++ b/third_party/WebKit/Source/core/dom/Element.h
@@ -439,6 +439,17 @@ class CORE_EXPORT Element : public ContainerNode {
   // display none.
   const ComputedStyle* ensureComputedStyle(PseudoId = PseudoIdNone);
 
+  const ComputedStyle* nonLayoutObjectComputedStyle() const;
+
+  bool hasDisplayContentsStyle() const;
+
+  ComputedStyle* mutableNonLayoutObjectComputedStyle() const {
+    return const_cast<ComputedStyle*>(nonLayoutObjectComputedStyle());
+  }
+
+  bool shouldStoreNonLayoutObjectComputedStyle(const ComputedStyle&) const;
+  void storeNonLayoutObjectComputedStyle(PassRefPtr<ComputedStyle>);
+
   // Methods for indicating the style is affected by dynamic updates (e.g.,
   // children changing, our position changing in our sibling list, etc.)
   bool styleAffectedByEmpty() const {