Encoding API: ignore leading/trailing whitespace in labels

Source/modules/encoding/Encoding.cpp

+// 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.
+
+#include "config.h"
+#include "modules/encoding/Encoding.h"
+
+namespace blink {
+
+namespace Encoding {
+
+bool isASCIIWhiteSpace(UChar c)
+{
+    // From Encoding Standard:
+    // "The ASCII whitespace are code points U+0009, U+000A, U+000C, U+000D, and U+0020."
+    return c == 0x09 || c == 0x0A || c == 0x0C || c == 0x0D || c == 0x20;
+}
+
+} // namespace Encoding
+
+} // namespace blink