Add CSS parser support for the snap-height property

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSPropertyParser.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSBasicShapeValues.h"
 #include "core/css/CSSBorderImage.h"
 #include "core/css/CSSCalculationValue.h"
@@ skipping 1271 matching lines @@
 
     if (!orientation && !pageSize)
         return nullptr;
     if (pageSize)
         result->append(pageSize.release());
     if (orientation)
         result->append(orientation.release());
     return result.release();
 }
 
+static PassRefPtrWillBeRawPtr<CSSValue> consumeSnapHeight(CSSParserTokenRange& range, CSSParserMode cssParserMode)
+{
+    RefPtrWillBeRawPtr<CSSPrimitiveValue> unit = consumeLength(range, cssParserMode, ValueRangeNonNegative);
+    if (!unit)
+        return nullptr;
+    RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
+    list->append(unit.release());
+
+    if (RefPtrWillBeRawPtr<CSSPrimitiveValue> position = consumePositiveInteger(range)) {
+        if (position->getIntValue() > 100)
+            return nullptr;
+        list->append(position.release());
+    }
+
+    return list.release();
+}
+
 static PassRefPtrWillBeRawPtr<CSSValue> consumeTextIndent(CSSParserTokenRange& range, CSSParserMode cssParserMode)
 {
     // [ <length> | <percentage> ] && hanging? && each-line?
     // Keywords only allowed when css3Text is enabled.
     RefPtrWillBeRawPtr<CSSValueList> list = CSSValueList::createSpaceSeparated();
 
     bool hasLengthOrPercentage = false;
     bool hasEachLine = false;
     bool hasHanging = false;
 
@@ skipping 2116 matching lines @@
     case CSSPropertyTranslate:
         return consumeTranslate(m_range, m_context.mode());
     case CSSPropertyWebkitBorderHorizontalSpacing:
     case CSSPropertyWebkitBorderVerticalSpacing:
         return consumeLength(m_range, m_context.mode(), ValueRangeNonNegative);
     case CSSPropertyCounterIncrement:
     case CSSPropertyCounterReset:
         return consumeCounter(m_range, m_context.mode(), property == CSSPropertyCounterIncrement ? 1 : 0);
     case CSSPropertySize:
         return consumeSize(m_range, m_context.mode());
+    case CSSPropertySnapHeight:
+        return consumeSnapHeight(m_range, m_context.mode());
     case CSSPropertyTextIndent:
         return consumeTextIndent(m_range, m_context.mode());
     case CSSPropertyMaxWidth:
     case CSSPropertyMaxHeight:
         return consumeMaxWidthOrHeight(m_range, m_context, UnitlessQuirk::Allow);
     case CSSPropertyWebkitMaxLogicalWidth:
     case CSSPropertyWebkitMaxLogicalHeight:
         return consumeMaxWidthOrHeight(m_range, m_context);
     case CSSPropertyMinWidth:
     case CSSPropertyMinHeight:
@@ skipping 954 matching lines @@
         m_currentShorthand = oldShorthand;
         CSSParserValueList valueList(m_range);
         if (!valueList.size())
             return false;
         m_valueList = &valueList;
         return legacyParseShorthand(unresolvedProperty, important);
     }
 }
 
 } // namespace blink