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

Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl

Index: Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
diff --git a/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl b/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
index 25853f8c9e4e99feba4c022882a5823e29ecd179..7cb7dc4dd13d3b313a2196ffb6a6b90e7f4f2fe0 100644
--- a/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
+++ b/Source/build/scripts/templates/StyleBuilderFunctions.cpp.tmpl
@@ -523,6 +523,29 @@ namespace WebCore {
 {{apply_alignment('CSSPropertyAlignItems', 'AlignItems')}}
 {{apply_alignment('CSSPropertyAlignSelf', 'AlignSelf')}}
 
+{% macro apply_alignment1(property_id, alignment_type) %}

[cbiesinger, 2014/06/21 00:45:23]

That is a terrible name for this macro. Please rename to
apply_alignment_with_legacy_keyword.

+{{declare_value_function(property_id)}}
+{
+    CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
+    if (Pair* pairValue = primitiveValue->getPairValue()) {
+        if (pairValue->first()->getValueID() == CSSValueLegacy) {
+            state.style()->set{{alignment_type}}IsLegacy(true);
+            state.style()->set{{alignment_type}}(*pairValue->second());
+        } else {
+            state.style()->set{{alignment_type}}IsLegacy(false);
+            state.style()->set{{alignment_type}}(*pairValue->first());
+            state.style()->set{{alignment_type}}OverflowAlignment(*pairValue->second());
+        }
+    } else {
+        state.style()->set{{alignment_type}}IsLegacy(false);
+        state.style()->set{{alignment_type}}(*primitiveValue);
+        // FIXME: We should clear the overflow-alignment mode here and probably
+        // also set it in the initial and inherit handlers
+    }
+}
+{% endmacro %}
+{{apply_alignment1('CSSPropertyJustifyItems', 'JustifyItems')}}
+
 {% macro apply_svg_paint(property_id, paint_type) %}
 {% set property = properties[property_id] %}
 {{declare_initial_function(property_id)}}