PlzNavigate: identify same-page browser-initiated navigation.

url/url_util.cc

Index: url/url_util.cc
diff --git a/url/url_util.cc b/url/url_util.cc
index 9a2cce47aa116c047e8d49cc6235941be944075d..ef3f72fa8cef6d666dd8fae79468d9c6d71514ef 100644
--- a/url/url_util.cc
+++ b/url/url_util.cc
@@ -683,6 +683,16 @@ bool HostIsIPAddress(base::StringPiece host) {
   return host_info.IsIPAddress();
 }
 
+bool IsFragmentAddedOrUpdated(const GURL& old_url, const GURL& new_url) {
+  if (!new_url.has_ref() || old_url == new_url)
+    return false;
+
+  url::Replacements<char> replacements;
+  replacements.ClearRef();
+  return old_url.ReplaceComponents(replacements) ==
+         new_url.ReplaceComponents(replacements);
+}
+
 bool Canonicalize(const char* spec,
                   int spec_len,
                   bool trim_path_end,