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

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 3041 matching lines @@
 
   if (!node())
     return nullptr;
 
   Element* element = Traversal<Element>::firstAncestorOrSelf(*node());
   if (!element)
     return nullptr;
 
   if (pseudoStyleRequest.pseudoId == PseudoIdFirstLineInherited) {
     RefPtr<ComputedStyle> result =
-        document().ensureStyleResolver().styleForElement(element, parentStyle,
-                                                         DisallowStyleSharing);
+        document().ensureStyleResolver().styleForElement(
+            element, parentStyle, parentStyle, DisallowStyleSharing);
     result->setStyleType(PseudoIdFirstLineInherited);
     return result.release();
   }
 
   return document().ensureStyleResolver().pseudoStyleForElement(
-      element, pseudoStyleRequest, parentStyle);
+      element, pseudoStyleRequest, parentStyle, parentStyle);
 }
 
 PassRefPtr<ComputedStyle>
 LayoutObject::getUncachedPseudoStyleFromParentOrShadowHost() const {
   if (!node())
     return nullptr;
 
   if (ShadowRoot* root = node()->containingShadowRoot()) {
     if (root->type() == ShadowRootType::UserAgent) {
       if (Element* shadowHost = node()->ownerShadowHost()) {
@@ skipping 428 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif