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

Source/core/css/resolver/StyleAdjuster.cpp

Index: Source/core/css/resolver/StyleAdjuster.cpp
diff --git a/Source/core/css/resolver/StyleAdjuster.cpp b/Source/core/css/resolver/StyleAdjuster.cpp
index 91edb430ee0bd5e1f29df19ae155d704db5defaa..b1b9fca52a68df16cc43f681cf9f9c742a4312df 100644
--- a/Source/core/css/resolver/StyleAdjuster.cpp
+++ b/Source/core/css/resolver/StyleAdjuster.cpp
@@ -254,6 +254,62 @@ void StyleAdjuster::adjustRenderStyle(RenderStyle* style, RenderStyle* parentSty
         style->setTextAutosizingMultiplier(e->renderStyle()->textAutosizingMultiplier());
         style->setUnique();
     }
+
+    adjustStyleForAlignment(style, parentStyle);
+}
+
+void StyleAdjuster::adjustStyleForAlignment(RenderStyle* style, RenderStyle* parentStyle)

[esprehn, 2014/07/12 00:39:19]

These should both be references.

+{
+    // If the inherited value of justify-items includes the legacy keyword, 'auto'
+    // computes to the the inherited value.
+    if (style->justifyItems() == ItemPositionAuto) {
+        if (parentStyle->justifyItemsPositionType() == LegacyPosition) {
+            style->setJustifyItems(parentStyle->justifyItems());
+            style->setJustifyItemsPositionType(parentStyle->justifyItemsPositionType());
+        // Otherwise, auto computes to:
+        } else if (style->isDisplayFlexibleOrGridBox()) {
+            // 'stretch' for flex containers and grid containers.
+            style->setJustifyItems(ItemPositionStretch);
+        } else {
+            // 'start' for everything else.
+            style->setJustifyItems(ItemPositionStart);
+        }
+    }
+
+    // The 'auto' keyword computes to 'stretch' on absolutely-positioned elements,
+    if (style->justifySelf() == ItemPositionAuto) {
+        if (style->position() == AbsolutePosition) {
+            style->setJustifySelf(ItemPositionStretch);
+        } else {
+            // and to the computed value of justify-items on the parent (minus
+            // any legacy keywords) on all other boxes.
+            style->setJustifySelf(parentStyle->justifyItems());
+            style->setJustifySelfOverflowAlignment(parentStyle->justifyItemsOverflowAlignment());
+        }
+    }
+
+    // The 'auto' keyword computes to:
+    if (style->alignItems() == ItemPositionAuto) {
+        if (style->isDisplayFlexibleOrGridBox()) {
+            // 'stretch' for flex containers and grid containers,
+            style->setAlignItems(ItemPositionStretch);
+        } else {
+            // 'start' for everything else
+            style->setAlignItems(ItemPositionStart);
+        }
+    }
+
+    // The 'auto' keyword computes to 'stretch' on absolutely-positioned elements,
+    if (style->alignSelf() == ItemPositionAuto) {
+        if ((style->position() == AbsolutePosition) || (parentStyle->alignItems() == ItemPositionAuto)) {
+            style->setAlignSelf(ItemPositionStretch);
+        } else {
+            // and to the computed value of align-items on the parent (minus
+            // any 'legacy' keywords) on all other boxes.
+            style->setAlignSelf(parentStyle->alignItems());
+            style->setAlignSelfOverflowAlignment(parentStyle->alignItemsOverflowAlignment());
+        }
+    }
 }
 
 void StyleAdjuster::adjustStyleForTagName(RenderStyle* style, RenderStyle* parentStyle, Element& element)