Add an experimental flag to change location.reload to take a hard-reload

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
@@ skipping 383 matching lines @@
   DCHECK(IsReloadLoadType(load_type));
   if (client_redirect_policy == ClientRedirectPolicy::kNotClientRedirect) {
     if (!loader_.GetDocumentLoader()->GetHistoryItem())
       return;
     FrameLoadRequest request = FrameLoadRequest(
         nullptr, loader_.ResourceRequestForReload(load_type, KURL(),
                                                   client_redirect_policy));
     request.SetClientRedirect(client_redirect_policy);
     loader_.Load(request, load_type);
   } else {
-    DCHECK_EQ(kFrameLoadTypeReload, load_type);
+    DCHECK_EQ(RuntimeEnabledFeatures::locationHardReloadEnabled()
+                  ? kFrameLoadTypeReloadBypassingCache
+                  : kFrameLoadTypeReload,
+              load_type);
     navigation_scheduler_->ScheduleReload();
   }
 }
 
 void LocalFrame::Detach(FrameDetachType type) {
   // Note that detach() can be re-entered, so it's not possible to
   // DCHECK(isAttached()) here.
   lifecycle_.AdvanceTo(FrameLifecycle::kDetaching);
 
   if (IsLocalRoot())
@@ skipping 548 matching lines @@
   if (Client() &&
       Client()->ShouldUseClientLoFiForRequest(params.GetResourceRequest())) {
     params.MutableResourceRequest().SetPreviewsState(
         params.GetResourceRequest().GetPreviewsState() |
         WebURLRequest::kClientLoFiOn);
     params.SetAllowImagePlaceholder();
   }
 }
 
 }  // namespace blink