Introduce webkit_glue::Latin1OrUTF16ToUTF16

webkit/glue/latin1_string_conversions.h

Index: webkit/glue/latin1_string_conversions.h
diff --git a/webkit/glue/latin1_string_conversions.h b/webkit/glue/latin1_string_conversions.h
new file mode 100644
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+++ b/webkit/glue/latin1_string_conversions.h
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+// Copyright (c) 2013 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 WEBKIT_GLUE_LATIN1_STRING_CONVERSIONS_H_
+#define WEBKIT_GLUE_LATIN1_STRING_CONVERSIONS_H_
+
+#include <string>
+
+#include "base/base_export.h"
+#include "base/string16.h"
+#include "webkit/glue/webkit_glue_export.h"
+
+namespace webkit_glue {
+
+// This definition of Latin1Char matches the definition of LChar in Blink. We
+// use unsigned char rather than char to make less tempting to mix and match
+// Latin-1 and UTF-8 characters..
+typedef unsigned char Latin1Char;
+
+// This somewhat odd function is designed to help us convert from Blink Strings
+// to string16. A Blink string is either backed by an array of Latin-1
+// characters or an array of UTF-16 characters. This function is called by
+// WebString::operator string16() to convert one or the other character array
+// to string16. This function is defined here rather than in WebString.h to
+// avoid binary bloat in all the callers of the conversion operator.
+WEBKIT_GLUE_EXPORT string16 Latin1OrUTF16ToUTF16(size_t length,
+                                                 const Latin1Char* latin1,
+                                                 const char16* utf16);
+
+}  // namespace webkit_glue
+
+#endif  // WEBKIT_GLUE_LATIN1_STRING_CONVERSIONS_H_