Have Permission{Manager,Service} use Origin.

url/origin.cc

 // 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.
 
 #include "url/origin.h"
 
 #include <stdint.h>
 #include <string.h>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "url/gurl.h"
 #include "url/url_canon.h"
 #include "url/url_canon_stdstring.h"
 #include "url/url_constants.h"
 #include "url/url_util.h"
 
 namespace url {
 
-Origin::Origin() : unique_(true) {
-}
+Origin::Origin() : unique_(true), empty_(false) {}
 
-Origin::Origin(const GURL& url) : unique_(true) {
-  if (!url.is_valid() || (!url.IsStandard() && !url.SchemeIsBlob()))
+Origin::Origin(const GURL& url)
+    : unique_(!url.is_empty()), empty_(url.is_empty()) {
+  if (!url.is_valid() || (!url.IsStandard() && !url.SchemeIsBlob())) {
     return;
+  }
 
   if (url.SchemeIsFileSystem()) {
     tuple_ = SchemeHostPort(*url.inner_url());
   } else if (url.SchemeIsBlob()) {
     // If we're dealing with a 'blob:' URL, https://url.spec.whatwg.org/#origin
     // defines the origin as the origin of the URL which results from parsing
     // the "path", which boils down to everything after the scheme. GURL's
     // 'GetContent()' gives us exactly that.
     tuple_ = SchemeHostPort(GURL(url.GetContent()));
   } else {
     tuple_ = SchemeHostPort(url);
   }
 
   unique_ = tuple_.IsInvalid();
 }
 
+Origin::Origin(const std::string& url_string) : Origin(GURL(url_string)) {}
+
 Origin::Origin(base::StringPiece scheme, base::StringPiece host, uint16_t port)
     : tuple_(scheme, host, port) {
   unique_ = tuple_.IsInvalid();
+  empty_ = scheme.empty() && host.empty() && port == 0;
 }
 
 Origin::~Origin() {
 }
 
 // static
 Origin Origin::UnsafelyCreateOriginWithoutNormalization(
     base::StringPiece scheme,
     base::StringPiece host,
     uint16_t port) {
   return Origin(scheme, host, port);
 }
 
 std::string Origin::Serialize() const {
+  if (empty())
+    return "";
+
   if (unique())
     return "null";
 
   if (scheme() == kFileScheme)
     return "file://";
 
   return tuple_.Serialize();
 }
 
 bool Origin::IsSameOriginWith(const Origin& other) const {
+  if (empty_ && other.empty_)
+    return true;
+
   if (unique_ || other.unique_)
     return false;
 
   return tuple_.Equals(other.tuple_);
 }
 
 bool Origin::operator<(const Origin& other) const {
   return tuple_ < other.tuple_;
 }
 
 std::ostream& operator<<(std::ostream& out, const url::Origin& origin) {
   return out << origin.Serialize();
 }
 
 bool IsSameOriginWith(const GURL& a, const GURL& b) {
   return Origin(a).IsSameOriginWith(Origin(b));
 }
 
 }  // namespace url