[CSS Grid Layout] Adapting align-self, align-items and justify-self to the last CSS 3 spec.

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 236 matching lines @@
         if ((isSVGForeignObjectElement(*e) || isSVGTextElement(*e)) && style->isDisplayInlineType())
             style->setDisplay(BLOCK);
     }
 
     if (e && e->renderStyle() && e->renderStyle()->textAutosizingMultiplier() != 1) {
         // Preserve the text autosizing multiplier on style recalc.
         // (The autosizer will update it during layout if it needs to be changed.)
         style->setTextAutosizingMultiplier(e->renderStyle()->textAutosizingMultiplier());
         style->setUnique();
     }
+
+    adjustStyleForAlignment(*style, *parentStyle);
+}
+
+void StyleAdjuster::adjustStyleForAlignment(RenderStyle& style, const RenderStyle& parentStyle)
+{
+    bool isFlexOrGrid = style.isDisplayFlexibleOrGridBox();
+    bool absolutePositioned = style.position() == AbsolutePosition;
+
+    // If the inherited value of justify-items includes the legacy keyword, 'auto'
+    // computes to the the inherited value.
+    // Otherwise, auto computes to:
+    //  - 'stretch' for flex containers and grid containers.
+    //  - 'start' for everything else.
+    if (style.justifyItems() == ItemPositionAuto) {
+        if (parentStyle.justifyItemsPositionType() == LegacyPosition) {
+            style.setJustifyItems(parentStyle.justifyItems());
+            style.setJustifyItemsPositionType(parentStyle.justifyItemsPositionType());
+        } else if (isFlexOrGrid) {
+            style.setJustifyItems(ItemPositionStretch);
+        }
+    }
+
+    // The 'auto' keyword computes to 'stretch' on absolutely-positioned elements,
+    // and to the computed value of justify-items on the parent (minus
+    // any legacy keywords) on all other boxes.
+    if (style.justifySelf() == ItemPositionAuto) {
+        if (absolutePositioned) {
+            style.setJustifySelf(ItemPositionStretch);
+        } else {
+            style.setJustifySelf(parentStyle.justifyItems());
+            style.setJustifySelfOverflowAlignment(parentStyle.justifyItemsOverflowAlignment());
+        }
+    }
+
+    // The 'auto' keyword computes to:
+    //  - 'stretch' for flex containers and grid containers,
+    //  - 'start' for everything else.
+    if (style.alignItems() == ItemPositionAuto) {
+        if (isFlexOrGrid)
+            style.setAlignItems(ItemPositionStretch);
+    }
+
+    // The 'auto' keyword computes to 'stretch' on absolutely-positioned elements,
+    // and to the computed value of align-items on the parent (minus
+    // any 'legacy' keywords) on all other boxes.
+    if (style.alignSelf() == ItemPositionAuto) {
+        if (absolutePositioned) {
+            style.setAlignSelf(ItemPositionStretch);
+        } else {
+            style.setAlignSelf(parentStyle.alignItems());
+            style.setAlignSelfOverflowAlignment(parentStyle.alignItemsOverflowAlignment());
+        }
+    }
 }
 
 void StyleAdjuster::adjustStyleForTagName(RenderStyle* style, RenderStyle* parentStyle, Element& element)
 {
     // <div> and <span> are the most common elements on the web, we skip all the work for them.
     if (isHTMLDivElement(element) || isHTMLSpanElement(element))
         return;
 
     if (isHTMLTableCellElement(element)) {
         // If we have a <td> that specifies a float property, in quirks mode we just drop the float property.
@@ skipping 131 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));
     }
 }
 
 }