Implements CSSPropertyAPI for the webkit-line-clamp property.

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

+// 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/CSSPropertyAPIWebkitLineClamp.h"
+
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPIWebkitLineClamp::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext* context) {
+  if (range.peek().type() != PercentageToken &&
+      range.peek().type() != NumberToken)
+    return nullptr;
+  CSSPrimitiveValue* clampValue =
+      CSSPropertyParserHelpers::consumePercent(range, ValueRangeNonNegative);
+  if (clampValue)
+    return clampValue;
+  // When specifying number of lines, don't allow 0 as a valid value.
+  return CSSPropertyParserHelpers::consumePositiveInteger(range);
+}
+
+}  // namespace blink