PlzNavigate: identify same-page browser-initiated navigation.

net/base/url_util.h

Index: net/base/url_util.h
diff --git a/net/base/url_util.h b/net/base/url_util.h
index 75f7b620be0686210434d30c4452d76efb40997f..8a83686c67236c2c8b6e78569febdfc43dfd964c 100644
--- a/net/base/url_util.h
+++ b/net/base/url_util.h
@@ -150,6 +150,11 @@ NET_EXPORT bool IsHostnameNonUnique(const std::string& hostname);
 // machine.
 NET_EXPORT bool IsLocalhost(base::StringPiece host);
 
+// Checks whether or not two URLs are differing only in the fragment (the part
+// after the # character). Returns false when the new URL has no fragment.
+NET_EXPORT bool IsFragmentAddedOrUpdated(const GURL& old_url,
+                                         const GURL& new_url);
+
 // Strip the portions of |url| that aren't core to the network request.
 //   - user name / password
 //   - reference section