FasterLocationReload: use ReloadMainResource for JS exposed reloads

third_party/WebKit/Source/core/frame/History.cpp

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 127 matching lines @@
   if (!activeDocument)
     return;
 
   if (!activeDocument->frame() ||
       !activeDocument->frame()->canNavigate(*frame())) {
     return;
   }
   if (!NavigationDisablerForUnload::isNavigationAllowed())
     return;
 
-  // We intentionally call reload() for the current frame if delta is zero.
-  // Otherwise, navigation happens on the root frame.
-  // This behavior is designed in the following spec.
-  // https://html.spec.whatwg.org/multipage/browsers.html#dom-history-go
-  if (delta)
+  if (delta) {
     frame()->loader().client()->navigateBackForward(delta);
-  else
-    frame()->reload(FrameLoadTypeReload, ClientRedirectPolicy::ClientRedirect);
+  } else {
+    // We intentionally call reload() for the current frame if delta is zero.
+    // Otherwise, navigation happens on the root frame.
+    // This behavior is designed in the following spec.
+    // https://html.spec.whatwg.org/multipage/browsers.html#dom-history-go
+    FrameLoadType reloadType =
+        RuntimeEnabledFeatures::fasterLocationReloadEnabled()
+            ? FrameLoadTypeReloadMainResource
+            : FrameLoadTypeReload;
+    frame()->reload(reloadType, ClientRedirectPolicy::ClientRedirect);
+  }
 }
 
 KURL History::urlForState(const String& urlString) {
   Document* document = frame()->document();
 
   if (urlString.isNull())
     return document->url();
   if (urlString.isEmpty())
     return document->baseURL();
 
@@ skipping 49 matching lines @@
         frame()->document()->url().elidedString() + "'.");
     return;
   }
 
   frame()->loader().updateForSameDocumentNavigation(
       fullURL, SameDocumentNavigationHistoryApi, std::move(data),
       restorationType, type, frame()->document());
 }
 
 }  // namespace blink