Implements CSSPropertyAPI for the tab-size property.

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPITabSize.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPITabSize.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPITabSize.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..884ede0feb133c1bc7c4da8903d2835ef997fd84
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPITabSize.cpp
@@ -0,0 +1,23 @@
+// 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/CSSPropertyAPITabSize.h"
+
+#include "core/css/parser/CSSParserContext.h"
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPITabSize::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext* context) {
+  CSSPrimitiveValue* parsedValue =
+      CSSPropertyParserHelpers::consumeInteger(range, 0);
+  if (parsedValue)
+    return parsedValue;
+  return CSSPropertyParserHelpers::consumeLength(range, context->mode(),
+                                                 ValueRangeNonNegative);
+}
+
+}  // namespace blink