Move metafile printing code from platform canvas to PaintCanvas

printing/metafile_skia_wrapper.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PRINTING_METAFILE_SKIA_WRAPPER_H_
 #define PRINTING_METAFILE_SKIA_WRAPPER_H_
 
+#include "cc/paint/paint_canvas.h"
 #include "printing/printing_export.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 
-class SkCanvas;
-
 namespace printing {
 
 class PdfMetafileSkia;
 
 // A wrapper class with static methods to set and retrieve a PdfMetafileSkia
 // on an SkCanvas.  The ownership of the metafile is not affected and it
 // is the caller's responsibility to ensure that the metafile remains valid
 // as long as the canvas.
 class PRINTING_EXPORT MetafileSkiaWrapper : public SkRefCnt {
  public:
-  static void SetMetafileOnCanvas(const SkCanvas& canvas,
+  static void SetMetafileOnCanvas(cc::PaintCanvas* canvas,
                                   PdfMetafileSkia* metafile);
 
-  static PdfMetafileSkia* GetMetafileFromCanvas(const SkCanvas& canvas);
+  static PdfMetafileSkia* GetMetafileFromCanvas(cc::PaintCanvas* canvas);
 
  private:
   explicit MetafileSkiaWrapper(PdfMetafileSkia* metafile);
 
   PdfMetafileSkia* metafile_;
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_METAFILE_SKIA_WRAPPER_H_