Encoding API: ignore leading/trailing whitespace in labels

Source/modules/encoding/Encoding.h

Index: Source/modules/encoding/Encoding.h
diff --git a/Source/modules/encoding/Encoding.h b/Source/modules/encoding/Encoding.h
new file mode 100644
index 0000000000000000000000000000000000000000..540054888321fe4b634ed7f0541f72d48856a80d
--- /dev/null
+++ b/Source/modules/encoding/Encoding.h
@@ -0,0 +1,22 @@
+// Copyright 2015 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.
+
+#ifndef Encoding_h
+#define Encoding_h
+
+#include "wtf/unicode/Unicode.h"
+
+namespace blink {
+
+namespace Encoding {
+
+// The Encoding Standard has a definition of whitespace that differs from
+// WTF::isWhiteSpace() (it excludes vertical tab).
+bool isASCIIWhiteSpace(UChar);
+
+} // namespace Encoding
+
+} // namespace blink
+
+#endif // Encoding_h