Implements CSSPropertyAPI for the column-gap property.

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIColumnGap.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIColumnGap.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIColumnGap.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..cc3374b9a32b0e1b0b9d0feaa462d7b49e3fdf35
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIColumnGap.cpp
@@ -0,0 +1,21 @@
+// Copyright 2017 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/properties/CSSPropertyAPIColumnGap.h"
+
+#include "core/css/parser/CSSParserContext.h"
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPIColumnGap::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context) {
+  if (range.peek().id() == CSSValueNormal)
+    return CSSPropertyParserHelpers::consumeIdent(range);
+  return CSSPropertyParserHelpers::consumeLength(range, context.mode(),
+                                                 ValueRangeNonNegative);
+}
+
+}  // namespace blink