Let StyleResolver figure out differences between UA style and resolved style.

Source/core/css/resolver/StyleAdjuster.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 133 matching lines @@
             if (RuntimeEnabledFeatures::cssCompositingEnabled())
                 return true;
             break;
         default:
             break;
         }
     }
     return false;
 }
 
-void StyleAdjuster::adjustLayoutStyle(LayoutStyle& style, const LayoutStyle& parentStyle, Element *e, const CachedUAStyle* cachedUAStyle)
+void StyleAdjuster::adjustLayoutStyle(LayoutStyle& style, const LayoutStyle& parentStyle, Element *e, const AuthorStyleInfo& authorStyle)
 {
     if (style.display() != NONE) {
         if (e && e->isHTMLElement())
             adjustStyleForHTMLElement(style, parentStyle, toHTMLElement(*e));
 
         // Per the spec, position 'static' and 'relative' in the top layer compute to 'absolute'.
         if (isInTopLayer(e, style) && (style.position() == StaticPosition || style.position() == RelativePosition))
             style.setPosition(AbsolutePosition);
 
         // Absolute/fixed positioned elements, floating elements and the document element need block-like outside display.
@@ skipping 44 matching lines @@
 
     if (style.overflowX() != OVISIBLE || style.overflowY() != OVISIBLE)
         adjustOverflow(style);
 
     // Cull out any useless layers and also repeat patterns into additional layers.
     style.adjustBackgroundLayers();
     style.adjustMaskLayers();
 
     // Let the theme also have a crack at adjusting the style.
     if (style.hasAppearance())
-        LayoutTheme::theme().adjustStyle(style, e, cachedUAStyle);
+        LayoutTheme::theme().adjustStyle(style, e, authorStyle);
 
     // If we have first-letter pseudo style, transitions, or animations, do not share this style.
     if (style.hasPseudoStyle(FIRST_LETTER) || style.transitions() || style.animations())
         style.setUnique();
 
     // FIXME: when dropping the -webkit prefix on transform-style, we should also have opacity < 1 cause flattening.
     if (style.preserves3D() && (style.overflowX() != OVISIBLE
         || style.overflowY() != OVISIBLE
         || style.hasFilter()))
         style.setTransformStyle3D(TransformStyle3DFlat);
@@ skipping 256 matching lines @@
     if (style.writingMode() != TopToBottomWritingMode && (style.display() == BOX || style.display() == INLINE_BOX))
         style.setWritingMode(TopToBottomWritingMode);
 
     if (parentStyle.isDisplayFlexibleOrGridBox()) {
         style.setFloating(NoFloat);
         style.setDisplay(equivalentBlockDisplay(style.display(), style.isFloating(), !m_useQuirksModeStyles));
     }
 }
 
 }