[css-grid] Implement grid gutters

Source/core/css/parser/CSSPropertyParser.cpp

Index: Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/Source/core/css/parser/CSSPropertyParser.cpp b/Source/core/css/parser/CSSPropertyParser.cpp
index 415f1c423d1ebccb836c0fb79e4af934945a7574..5623554ca25e7177a51952961f63e5ce72168c4a 100644
--- a/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/Source/core/css/parser/CSSPropertyParser.cpp
@@ -1260,6 +1260,16 @@ bool CSSPropertyParser::parseValue(CSSPropertyID unresolvedProperty, bool import
         parsedValue = parseGridPosition();
         break;
 
+    case CSSPropertyGridColumnGap:
+    case CSSPropertyGridRowGap:
+        ASSERT(RuntimeEnabledFeatures::cssGridLayoutEnabled());
+        validPrimitive = validUnit(value, FLength | FNonNeg);
+        break;
+
+    case CSSPropertyGridGap:
+        ASSERT(RuntimeEnabledFeatures::cssGridLayoutEnabled());
+        return parseGridGapShorthand(important);
+
     case CSSPropertyGridColumn:
     case CSSPropertyGridRow:
         ASSERT(RuntimeEnabledFeatures::cssGridLayoutEnabled());
@@ -3416,6 +3426,49 @@ bool CSSPropertyParser::parseGridTemplateRowsAndAreas(PassRefPtrWillBeRawPtr<CSS
     return true;
 }
 
+bool CSSPropertyParser::parseGridGapShorthand(bool important)
+{
+    ShorthandScope scope(this, CSSPropertyGridGap);
+    ASSERT(shorthandForProperty(CSSPropertyGridGap).length() == 2);
+
+    CSSParserValue* value = m_valueList->current();
+    if (!value)
+        return false;
+
+    if (value->id == CSSValueNormal) {
+        if (m_valueList->next())
+            return false;
+        addProperty(CSSPropertyGridColumnGap, cssValuePool().createImplicitInitialValue(), important);
+        addProperty(CSSPropertyGridRowGap, cssValuePool().createImplicitInitialValue(), important);
+        return true;
+    }
+
+    if (!validUnit(value, FLength | FNonNeg))
+        return false;
+
+    RefPtrWillBeRawPtr<CSSPrimitiveValue> columnGap = createPrimitiveNumericValue(value);
+
+    value = m_valueList->next();
+    if (!value) {
+        addProperty(CSSPropertyGridColumnGap, columnGap, important);
+        addProperty(CSSPropertyGridRowGap, columnGap, important);
+        return true;
+    }
+
+    if (!validUnit(value, FLength | FNonNeg))
+        return false;
+
+    if (m_valueList->next())
+        return false;
+
+    RefPtrWillBeRawPtr<CSSPrimitiveValue> rowGap = createPrimitiveNumericValue(value);
+
+    addProperty(CSSPropertyGridColumnGap, columnGap, important);
+    addProperty(CSSPropertyGridRowGap, rowGap, important);
+
+    return true;
+}
+
 
 bool CSSPropertyParser::parseGridTemplateShorthand(bool important)
 {