[css-grid] Implement grid gutters

third_party/WebKit/Source/core/css/parser/LegacyCSSPropertyParser.cpp

Index: third_party/WebKit/Source/core/css/parser/LegacyCSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/LegacyCSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/LegacyCSSPropertyParser.cpp
index 267de532af62206e4160625e1694c8a17423c30b..603263f289696a1f322bfb45f52a8878532e9517 100644
--- a/third_party/WebKit/Source/core/css/parser/LegacyCSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/LegacyCSSPropertyParser.cpp
@@ -1146,6 +1146,16 @@ 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());
@@ -3167,6 +3177,39 @@ bool CSSPropertyParser::parseGridItemPositionShorthand(CSSPropertyID shorthandId
     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 (!validUnit(value, FLength | FNonNeg))
+        return false;
+
+    RefPtrWillBeRawPtr<CSSPrimitiveValue> columnGap = createPrimitiveNumericValue(value);
+    RefPtrWillBeRawPtr<CSSPrimitiveValue> rowGap = nullptr;
+
+    value = m_valueList->next();
+    if (value) {
+        if (!validUnit(value, FLength | FNonNeg))
+            return false;
+
+        rowGap = createPrimitiveNumericValue(value);
+        if (m_valueList->next())
+            return false;
+    } else {
+        rowGap = columnGap;
+    }
+
+    addProperty(CSSPropertyGridColumnGap, columnGap, important);
+    addProperty(CSSPropertyGridRowGap, rowGap, important);
+
+    return true;
+}
+
 bool CSSPropertyParser::parseGridTemplateRowsAndAreas(PassRefPtrWillBeRawPtr<CSSValue> templateColumns, bool important)
 {
     NamedGridAreaMap gridAreaMap;