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

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Google 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:
@@ skipping 224 matching lines @@
 
   bool shouldPerformFragmentNavigation(bool isFormSubmission,
                                        const String& httpMethod,
                                        FrameLoadType,
                                        const KURL&);
   void processFragment(const KURL&, FrameLoadType, LoadStartType);
 
   bool checkLoadCanStart(FrameLoadRequest&,
                          FrameLoadType,
                          NavigationPolicy,
-                         NavigationType);
+                         NavigationType,
+                         DocumentLoader*);
   void startLoad(FrameLoadRequest&, FrameLoadType, NavigationPolicy);
 
   enum class HistoryNavigationType { DifferentDocument, Fragment, HistoryApi };
   void setHistoryItemStateForCommit(FrameLoadType,
                                     HistoryCommitType,
                                     HistoryNavigationType);
 
   void loadInSameDocument(const KURL&,
                           PassRefPtr<SerializedScriptValue> stateObject,
                           FrameLoadType,
@@ skipping 70 matching lines @@
   SandboxFlags m_forcedSandboxFlags;
 
   bool m_dispatchingDidClearWindowObjectInMainWorld;
   bool m_protectProvisionalLoader;
   bool m_isNavigationHandledByClient;
 };
 
 }  // namespace blink
 
 #endif  // FrameLoader_h