Have Permission{Manager,Service} use Origin.

url/origin.h

Index: url/origin.h
diff --git a/url/origin.h b/url/origin.h
index aab1f05a2013cc84cd4aedbb91a9e10b0df88307..5c2600ffe4a4f39086057f34d0f7404af063551e 100644
--- a/url/origin.h
+++ b/url/origin.h
@@ -89,6 +89,9 @@ class URL_EXPORT Origin {
   // 3. 'file' URLs all parse as ("file", "", 0).
   explicit Origin(const GURL& url);
 
+  // A convenience: Origin(GURL(url_string)).
+  explicit Origin(const std::string& url_string);
+
   // Creates an Origin from a |scheme|, |host|, and |port|. All the parameters
   // must be valid and canonicalized. In particular, note that this cannot be
   // used to create unique origins; 'url::Origin()' is the right way to do that.
@@ -111,6 +114,10 @@ class URL_EXPORT Origin {
 
   bool unique() const { return unique_; }
 
+  // An Origin is empty if it was constructed from an empty GURL or empty
+  // string. Empty Origins are equal to each other, but not to unique Origins.
+  bool empty() const { return empty_; }
+
   // An ASCII serialization of the Origin as per Section 6.2 of RFC 6454, with
   // the addition that all Origins with a 'file' scheme serialize to "file://".
   std::string Serialize() const;
@@ -131,6 +138,7 @@ class URL_EXPORT Origin {
 
   SchemeHostPort tuple_;
   bool unique_;
+  bool empty_;
 };
 
 URL_EXPORT std::ostream& operator<<(std::ostream& out, const Origin& origin);