Implements CSSPropertyAPI for the webkit-line-clamp property.

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIWebkitLineClamp.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIWebkitLineClamp.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIWebkitLineClamp.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..982854e48a898928cadc5f08d1742963357bb88b
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIWebkitLineClamp.cpp
@@ -0,0 +1,25 @@
+// 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