Implements CSSPropertyAPI for letter and word spacing

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPILetterAndWordSpacing.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPILetterAndWordSpacing.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPILetterAndWordSpacing.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e70a171f3f94ceb363acd2d1cf17105e51da2a1c
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+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPILetterAndWordSpacing.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/CSSPropertyAPILetterAndWordSpacing.h"
+
+#include "core/css/parser/CSSParserContext.h"
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPILetterAndWordSpacing::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext* context) {
+  if (range.peek().id() == CSSValueNormal)
+    return CSSPropertyParserHelpers::consumeIdent(range);
+  // TODO(timloh): allow <percentage>s in word-spacing.
+  return CSSPropertyParserHelpers::consumeLength(
+      range, context->mode(), ValueRangeAll,
+      CSSPropertyParserHelpers::UnitlessQuirk::Allow);
+}
+
+}  // namespace blink