Provide the equivalent of GURL::DomainIs for url::Origin.

url/url_util.h

 // Copyright 2013 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_URL_UTIL_H_
 #define URL_URL_UTIL_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
 #include "url/third_party/mozilla/url_parse.h"
 #include "url/url_canon.h"
 #include "url/url_constants.h"
 #include "url/url_export.h"
 
 namespace url {
 
 // Init ------------------------------------------------------------------------
 
 // Initialization is NOT required, it will be implicitly initialized when first
@@ skipping 189 matching lines @@
 URL_EXPORT void DecodeURLEscapeSequences(const char* input,
                                          int length,
                                          CanonOutputW* output);
 
 // Escapes the given string as defined by the JS method encodeURIComponent. See
 // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/encodeURIComponent
 URL_EXPORT void EncodeURIComponent(const char* input,
                                    int length,
                                    CanonOutput* output);
 
+// Returns true if the |canonicalized_host| matches or is in the same domain as

[engedy, 2016/08/26 16:48:14]

I'd argue this should go into a new section before line 136.

// Domains --

[pkalinnikov, 2016/08/29 09:53:00]

Done.

+// the given |lower_ascii_domain| string. For example, if the canonicalized
+// hostname is "www.google.com", this will return true for "com", "google.com",
+// and "www.google.com" domains.
+//
+// The input domain should be a non-empty lower-case ASCII string to match the
+// canonicalized host. The host should be non-empty as well.
+URL_EXPORT bool DomainIs(base::StringPiece canonicalized_host,
+                         base::StringPiece lower_ascii_domain);
+
 }  // namespace url
 
 #endif  // URL_URL_UTIL_H_