Add url::Origin::GetURL() to convert Origins to URLs without reparsing

url/origin.h

 // 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.
 
 #ifndef URL_ORIGIN_H_
 #define URL_ORIGIN_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 104 matching lines @@
   // the addition that all Origins with a 'file' scheme serialize to "file://".
   std::string Serialize() const;
 
   // Two Origins are "same-origin" if their schemes, hosts, and ports are exact
   // matches; and neither is unique.
   bool IsSameOriginWith(const Origin& other) const;
   bool operator==(const Origin& other) const {
     return IsSameOriginWith(other);
   }
 
+  // Efficiently returns what GURL(Serialize()) would without re-parsing the
+  // URL. This can be used for the (rare) times a GURL representation is needed
+  // for an Origin.
+  // Note: The returned URL will not necessarily be serialized to the same value
+  // as the Origin would. The GURL will have an added "/" path for Origins with
+  // valid SchemeHostPorts and file Origins.
+  GURL GetURL() const;
+
   // Same as GURL::DomainIs. If |this| origin is unique, then returns false.
   bool DomainIs(base::StringPiece lower_ascii_domain) const;
 
   // Allows Origin to be used as a key in STL (for example, a std::set or
   // std::map).
   bool operator<(const Origin& other) const;
 
  private:
   Origin(base::StringPiece scheme, base::StringPiece host, uint16_t port);
 
   SchemeHostPort tuple_;
   bool unique_;
 };
 
 URL_EXPORT std::ostream& operator<<(std::ostream& out, const Origin& origin);
 
 URL_EXPORT bool IsSameOriginWith(const GURL& a, const GURL& b);
 
 }  // namespace url
 
 #endif  // URL_ORIGIN_H_