PlzNavigate: identify same-page browser-initiated navigation.

net/base/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.
 
 // This file contains a set of utility functions related to parsing,
 // manipulating, and interacting with URLs and hostnames. These functions are
 // intended to be of a text-processing nature, and should not attempt to use any
 // networking or blocking services.
 
 #ifndef NET_BASE_URL_UTIL_H_
@@ skipping 132 matching lines @@
 NET_EXPORT bool IsHostnameNonUnique(const std::string& hostname);
 
 // Returns true if |host| is one of the local hostnames
 // (e.g. "localhost") or IP addresses (IPv4 127.0.0.0/8 or IPv6 ::1).
 //
 // Note that this function does not check for IP addresses other than
 // the above, although other IP addresses may point to the local
 // machine.
 NET_EXPORT bool IsLocalhost(base::StringPiece host);
 
+// Checks whether or not two URL are an in-page navigation (differing only in
+// the fragment).
+NET_EXPORT bool AreURLsInPageNavigation(const GURL& existing_url,

[nasko, 2017/01/13 02:51:10]

nit: It is a bit strange to have "navigation" in the //net/ code, which only
deals with networking and has no concept of navigation. Can the method be named
by what it checks - whether the two URLs only differ in fragments.

+                                        const GURL& new_url);
+
 // Strip the portions of |url| that aren't core to the network request.
 //   - user name / password
 //   - reference section
 NET_EXPORT GURL SimplifyUrlForRequest(const GURL& url);
 
 // Extracts the unescaped username/password from |url|, saving the results
 // into |*username| and |*password|.
 NET_EXPORT_PRIVATE void GetIdentityFromURL(const GURL& url,
                                            base::string16* username,
                                            base::string16* password);
 
 // Returns true if the url's host is a Google server. This should only be used
 // for histograms and shouldn't be used to affect behavior.
 NET_EXPORT_PRIVATE bool HasGoogleHost(const GURL& url);
 
 // This function tests |host| to see if it is of any local hostname form.
 // |host| is normalized before being tested and if |is_local6| is not NULL then
 // it it will be set to true if the localhost name implies an IPv6 interface (
 // for instance localhost6.localdomain6).
 NET_EXPORT_PRIVATE bool IsLocalHostname(base::StringPiece host,
                                         bool* is_local6);
 
 }  // namespace net
 
 #endif  // NET_BASE_URL_UTIL_H_