Reduce string copies in GURL creation

third_party/WebKit/public/platform/WebStringUTF8Adaptor.h

 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2016 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebCustomElement_h
-#define WebCustomElement_h
+#ifndef WebStringUTF8Adaptor_h
+#define WebStringUTF8Adaptor_h
 
-#include "../platform/WebCommon.h"
+#include "base/strings/string_piece.h"
+#include "WebCommon.h"
+#include "WebPrivatePtr.h"
+
+namespace WTF {
+class CStringBuffer;
+}
 
 namespace blink {
 
 class WebString;
 
-class WebCustomElement {
+// This class lets you get UTF-8 data out of a String without mallocing a
+// separate buffer to hold the data if the String happens to be 8 bit and
+// contain only ASCII characters.
+class BLINK_COMMON_EXPORT WebStringUTF8Adaptor {
 public:
-    // Adds a name to the set of names embedders can use
-    // WebDocument::registerEmbedderCustomElement to register their
-    // own types for. Because Custom Element processing requires the
-    // set of valid names to be known ahead of time, this method
-    // should be called before an element with this name is created.
-    BLINK_EXPORT static void addEmbedderCustomElementName(const WebString& name);
+    WebStringUTF8Adaptor(const WebString& string);
+    ~WebStringUTF8Adaptor();
+
+    base::StringPiece asStringPiece() const { return m_stringPiece; }
 
 private:
-    WebCustomElement();
+    base::StringPiece m_stringPiece;
+
+    // Holds the UTF-8 buffer backing the string piece if conversion was necessary.
+    WebPrivatePtr<WTF::CStringBuffer> m_utf8Buffer;
 };
 
 } // namespace blink
 
 #endif