Compute minimum repaint and show them in overlay

Source/core/testing/Internals.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 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.
@@ skipping 259 matching lines @@
 
     PassRefPtrWillBeRawPtr<MallocStatistics> mallocStatistics() const;
     PassRefPtrWillBeRawPtr<TypeConversions> typeConversions() const;
 
     Vector<String> getReferencedFilePaths() const;
 
     void startTrackingRepaints(Document*, ExceptionState&);
     void stopTrackingRepaints(Document*, ExceptionState&);
     void updateLayoutIgnorePendingStylesheetsAndRunPostLayoutTasks(ExceptionState&);
     void updateLayoutIgnorePendingStylesheetsAndRunPostLayoutTasks(Node*, ExceptionState&);
+    void forceFullRepaint(Document*, ExceptionState&);
 
     PassRefPtrWillBeRawPtr<ClientRectList> draggableRegions(Document*, ExceptionState&);
     PassRefPtrWillBeRawPtr<ClientRectList> nonDraggableRegions(Document*, ExceptionState&);
 
     PassRefPtr<ArrayBuffer> serializeObject(PassRefPtr<SerializedScriptValue>) const;
     PassRefPtr<SerializedScriptValue> deserializeBuffer(PassRefPtr<ArrayBuffer>) const;
 
     String getCurrentCursorInfo(Document*, ExceptionState&);
 
     String markerTextForListItem(Element*, ExceptionState&);
@@ skipping 40 matching lines @@
     PassRefPtrWillBeRawPtr<ClientRectList> annotatedRegions(Document*, bool draggable, ExceptionState&);
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionState&);
     RefPtrWillBeMember<InternalRuntimeFlags> m_runtimeFlags;
     RefPtrWillBeMember<InternalProfilers> m_profilers;
 };
 
 } // namespace WebCore
 
 #endif