Reduce string copies in GURL creation

content/public/child/url_conversion.h

+// Copyright 2016 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 CONTENT_PUBLIC_CHILD_URL_CONVERSION_H_
+#define CONTENT_PUBLIC_CHILD_URL_CONVERSION_H_
+
+#include "content/common/content_export.h"
+
+class GURL;
+
+namespace blink {
+class WebString;
+}
+
+namespace content {
+
+// Gets the contents of a WebString and interprets it as a GURL. This is better
+// than getting a string out of WebString and passing it to GURL's constructor
+// because it handles the dual 8/16 bit nature of WebString without
+// intermediate copies.
+CONTENT_EXPORT GURL WebStringToGURL(const blink::WebString& web_string);
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_CHILD_URL_CONVERSION_H_