Implemented parseSingleValue in CSSPropertyAPICounterIncrement.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPICounterIncrement.cpp

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPICounterIncrement.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPICounterIncrement.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPICounterIncrement.cpp
index 5216fdff39b418c0adeeb1add011fca99d7149ef..f2c9d1fcd9747b503ff3c7efa52654be029e147a 100644
--- a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPICounterIncrement.cpp
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPICounterIncrement.cpp
@@ -4,4 +4,15 @@
 
 #include "core/css/properties/CSSPropertyAPICounterIncrement.h"
 
-namespace blink {}  // namespace blink
+#include "core/css/properties/CSSPropertyCounterUtils.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPICounterIncrement::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext&) {
+  return CSSPropertyCounterUtils::consumeCounter(
+      range, CSSPropertyCounterUtils::kIncrementDefaultValue);
+}
+
+}  // namespace blink