PlzNavigate: identify same-page browser-initiated navigation.

url/gurl.cc

Index: url/gurl.cc
diff --git a/url/gurl.cc b/url/gurl.cc
index 43f30528593ffe1a0d0ecf4a6a9e69cca8b9a956..d35a5b30d33d97ba0e8236b05fd2611bbbc768ae 100644
--- a/url/gurl.cc
+++ b/url/gurl.cc
@@ -467,6 +467,14 @@ bool GURL::DomainIs(base::StringPiece lower_ascii_domain) const {
   return url::DomainIs(host_piece(), lower_ascii_domain);
 }
 
+// static
+bool GURL::EqualsIgnoringRef(const GURL& x, const GURL& y) {
+  int ref_position_x = x.parsed_.CountCharactersBefore(url::Parsed::REF, true);
+  int ref_position_y = y.parsed_.CountCharactersBefore(url::Parsed::REF, true);
+  return base::StringPiece(x.spec_).substr(0, ref_position_x) ==
+         base::StringPiece(y.spec_).substr(0, ref_position_y);
+}
+
 void GURL::Swap(GURL* other) {
   spec_.swap(other->spec_);
   std::swap(is_valid_, other->is_valid_);