[CSS Grid Layout] Implement 'justify-items' parsing

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 108 matching lines @@
         || style->isFloating() || style->hasOutOfFlowPosition();
 }
 
 // FIXME: This helper is only needed because pseudoStyleForElement passes a null
 // element to adjustRenderStyle, so we can't just use element->isInTopLayer().
 static bool isInTopLayer(const Element* element, const RenderStyle* style)
 {
     return (element && element->isInTopLayer()) || (style && style->styleType() == BACKDROP);
 }
 
-static bool isDisplayFlexibleBox(EDisplay display)
-{
-    return display == FLEX || display == INLINE_FLEX;
-}
-
-static bool isDisplayGridBox(EDisplay display)
-{
-    return display == GRID || display == INLINE_GRID;
-}
-
 static bool parentStyleForcesZIndexToCreateStackingContext(const RenderStyle* parentStyle)
 {
-    return isDisplayFlexibleBox(parentStyle->display()) || isDisplayGridBox(parentStyle->display());
+    return parentStyle->isDisplayFlexibleOrGridBox();
 }
 
 static bool hasWillChangeThatCreatesStackingContext(const RenderStyle* style)
 {
     for (size_t i = 0; i < style->willChangeProperties().size(); ++i) {
         switch (style->willChangeProperties()[i]) {
         case CSSPropertyOpacity:
         case CSSPropertyTransform:
         case CSSPropertyWebkitTransform:
         case CSSPropertyTransformStyle:
@@ skipping 249 matching lines @@
         || style->display() == TABLE_HEADER_GROUP || style->display() == TABLE_ROW || style->display() == TABLE_ROW_GROUP
         || style->display() == TABLE_CELL)
         style->setWritingMode(parentStyle->writingMode());
 
     // FIXME: Since we don't support block-flow on flexible boxes yet, disallow setting
     // of block-flow to anything other than TopToBottomWritingMode.
     // https://bugs.webkit.org/show_bug.cgi?id=46418 - Flexible box support.
     if (style->writingMode() != TopToBottomWritingMode && (style->display() == BOX || style->display() == INLINE_BOX))
         style->setWritingMode(TopToBottomWritingMode);
 
-    if (isDisplayFlexibleBox(parentStyle->display()) || isDisplayGridBox(parentStyle->display())) {
+    if (parentStyle->isDisplayFlexibleOrGridBox()) {
         style->setFloating(NoFloat);
         style->setDisplay(equivalentBlockDisplay(style->display(), style->isFloating(), !m_useQuirksModeStyles));
     }
 }
 
 }