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

url/scheme_host_port.h

Index: url/scheme_host_port.h
diff --git a/url/scheme_host_port.h b/url/scheme_host_port.h
index 47a9041e2afd8e1db1b92654b0d72cfddef9bdd4..dc8862aab6f776b60beaec21d185b690a8f03f2f 100644
--- a/url/scheme_host_port.h
+++ b/url/scheme_host_port.h
@@ -16,6 +16,8 @@ class GURL;
 
 namespace url {
 
+struct Parsed;
+
 // This class represents a (scheme, host, port) tuple extracted from a URL.
 //
 // The primary purpose of this class is to represent relevant network-authority
@@ -111,6 +113,10 @@ class URL_EXPORT SchemeHostPort {
   // serialized as a unique Origin.
   std::string Serialize() const;
 
+  // Efficiently returns what GURL(Serialize()) would return, without needing to
+  // re-parse the URL.
+  GURL GetURL() const;
+
   // Two SchemeHostPort objects are "equal" iff their schemes, hosts, and ports
   // are exact matches.
   //
@@ -124,6 +130,8 @@ class URL_EXPORT SchemeHostPort {
   bool operator<(const SchemeHostPort& other) const;
 
  private:
+  std::string SerializeInternal(url::Parsed* parsed) const;
+
   std::string scheme_;
   std::string host_;
   uint16_t port_;