Reduce string copies in GURL creation

content/public/child/url_conversion.cc

+// 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.
+
+#include "content/public/child/url_conversion.h"
+
+#include "base/strings/string_piece.h"
+#include "third_party/WebKit/public/platform/WebStringUTF8Adaptor.h"
+#include "url/gurl.h"
+
+namespace content {
+
+GURL WebStringToGURL(const blink::WebString& web_string) {
+  // In the comon case URLs stored as WebStrings will be ASCII, so get the
+  // buffer out without copying when possible.
+  blink::WebStringUTF8Adaptor utf8(web_string);
+  return GURL(utf8.asStringPiece());
+}
+
+}  // namespace content