Add support for "image-set"

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

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index 6a5ef8dd3e0efa8398445c3fad36c36a0422aac8..7768591c61aa1216bb19366c38ac3102be76e134 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -1979,7 +1979,7 @@ static CSSValue* consumeCursor(CSSParserTokenRange& range, const CSSParserContex
         AtomicString uri(consumeUrl(range));
         if (!uri.isNull()) {
             image = createCSSImageValueWithReferrer(uri, context);
-        } else if (range.peek().type() == FunctionToken && range.peek().functionId() == CSSValueWebkitImageSet) {
+        } else if (range.peek().type() == FunctionToken && (range.peek().functionId() == CSSValueWebkitImageSet || range.peek().functionId() == CSSValueImageSet)) {
             image = consumeImageSet(range, context);
             if (!image)
                 return nullptr;
@@ -2432,7 +2432,7 @@ static CSSValue* consumeImage(CSSParserTokenRange& range, CSSParserContext conte
         return createCSSImageValueWithReferrer(uri, context);
     if (range.peek().type() == FunctionToken) {
         CSSValueID id = range.peek().functionId();
-        if (id == CSSValueWebkitImageSet)
+        if (id == CSSValueWebkitImageSet || id == CSSValueImageSet)
             return consumeImageSet(range, context);
         if (isGeneratedImage(id))
             return consumeGeneratedImage(range, context);