PlzNavigate: Invoke didStartProvisionalLoad() when the renderer initiates a navigation in startLoad(

third_party/WebKit/Source/core/loader/EmptyClients.h

 /*
  * Copyright (C) 2006 Eric Seidel (eric@webkit.org)
  * Copyright (C) 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012 Samsung Electronics. 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
@@ skipping 242 matching lines @@
 
   void dispatchWillSendRequest(ResourceRequest&) override {}
   void dispatchDidReceiveResponse(const ResourceResponse&) override {}
   void dispatchDidLoadResourceFromMemoryCache(
       const ResourceRequest&,
       const ResourceResponse&) override {}
 
   void dispatchDidHandleOnloadEvents() override {}
   void dispatchDidReceiveServerRedirectForProvisionalLoad() override {}
   void dispatchWillCommitProvisionalLoad() override {}
-  void dispatchDidStartProvisionalLoad() override {}
+  void dispatchDidStartProvisionalLoad(DocumentLoader*) override {}
   void dispatchDidReceiveTitle(const String&) override {}
   void dispatchDidChangeIcons(IconType) override {}
   void dispatchDidCommitLoad(HistoryItem*, HistoryCommitType) override {}
   void dispatchDidFailProvisionalLoad(const ResourceError&,
                                       HistoryCommitType) override {}
   void dispatchDidFailLoad(const ResourceError&, HistoryCommitType) override {}
   void dispatchDidFinishDocumentLoad() override {}
   void dispatchDidFinishLoad() override {}
   void dispatchDidChangeThemeColor() override {}
 
@@ skipping 185 matching lines @@
   Frame* nextSibling() const override { return nullptr; }
   Frame* firstChild() const override { return nullptr; }
   void frameFocused() const override {}
 };
 
 CORE_EXPORT void fillWithEmptyClients(Page::PageClients&);
 
 }  // namespace blink
 
 #endif  // EmptyClients_h