Fix print context to work under slimming paint.

Source/core/page/PrintContext.h

 /*
  * Copyright (C) 2007 Alp Toker <alp@atoker.com>
  * Copyright (C) 2007 Apple Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 10 matching lines @@
 #ifndef PrintContext_h
 #define PrintContext_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
+class SkCanvas;
+
 namespace blink {
 
 class Element;
 class LocalFrame;
 class FloatRect;
 class FloatSize;
-class GraphicsContext;
 class IntRect;
 class Node;
 
 class CORE_EXPORT PrintContext : public NoBaseWillBeGarbageCollectedFinalized<PrintContext> {
 public:
     explicit PrintContext(LocalFrame*);
     virtual ~PrintContext();
 
     LocalFrame* frame() const { return m_frame; }
 
@@ skipping 22 matching lines @@
     // Used by layout tests.
     static int pageNumberForElement(Element*, const FloatSize& pageSizeInPixels); // Returns -1 if page isn't found.
     static String pageProperty(LocalFrame* frame, const char* propertyName, int pageNumber);
     static bool isPageBoxVisible(LocalFrame* frame, int pageNumber);
     static String pageSizeAndMarginsInPixels(LocalFrame* frame, int pageNumber, int width, int height, int marginTop, int marginRight, int marginBottom, int marginLeft);
     static int numberOfPages(LocalFrame*, const FloatSize& pageSizeInPixels);
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
-    void outputLinkedDestinations(GraphicsContext&, const IntRect& pageRect);
+    void outputLinkedDestinations(SkCanvas*, const IntRect& pageRect);
 
     RawPtrWillBeMember<LocalFrame> m_frame;
     Vector<IntRect> m_pageRects;
 
 private:
     void computePageRectsWithPageSizeInternal(const FloatSize& pageSizeInPixels);
     void collectLinkedDestinations(Node*);
 
     // Used to prevent misuses of begin() and end() (e.g., call end without begin).
     bool m_isPrinting;
 
     WillBeHeapHashMap<String, RawPtrWillBeMember<Element>> m_linkedDestinations;
     bool m_linkedDestinationsValid;
 };
 
 }
 
 #endif