PdfMetafileSkia gives out a SkCanvas, not a SkBaseDevice.

printing/pdf_metafile_skia.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_PDF_METAFILE_SKIA_H_
 #define PRINTING_PDF_METAFILE_SKIA_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "printing/metafile.h"
+#include "skia/ext/vector_canvas.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 class SkBaseDevice;
 
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 namespace base {
 struct FileDescriptor;
@@ skipping 32 matching lines @@
   virtual bool Playback(gfx::NativeDrawingContext hdc,
                         const RECT* rect) const override;
   virtual bool SafePlayback(gfx::NativeDrawingContext hdc) const override;
 #elif defined(OS_MACOSX)
   bool RenderPage(unsigned int page_number,
                   gfx::NativeDrawingContext context,
                   const CGRect rect,
                   const MacRenderPageParams& params) const override;
 #endif
 
+  bool SaveTo(base::File* file) const override;
+
 #if defined(OS_CHROMEOS) || defined(OS_ANDROID)
   // TODO(vitalybuka): replace with SaveTo().
   bool SaveToFD(const base::FileDescriptor& fd) const;
 #endif  // if defined(OS_CHROMEOS) || defined(OS_ANDROID)
 
   // Return a new metafile containing just the current page in draft mode.
   scoped_ptr<PdfMetafileSkia> GetMetafileForCurrentPage();
 
   // This method calls StartPage and then returns an appropriate
-  // VectorPlatformDevice implementation bound to the context created by
-  // StartPage or NULL on error.
-  SkBaseDevice* StartPageForVectorCanvas(const gfx::Size& page_size,
-                                         const gfx::Rect& content_area,
-                                         const float& scale_factor);
+  // VectorCanvas implementation bound to the context created by
+  // StartPage or NULL on error.  The skia::VectorCanvas pointer that
+  // is returned is owned by this PdfMetafileSkia object and does not
+  // need to be ref()ed or unref()ed.  The canvas will remain valid
+  // until FinishPage() or FinishDocument() is called.
+  skia::VectorCanvas* GetVectorCanvasForNewPage(const gfx::Size& page_size,
+                                                const gfx::Rect& content_area,
+                                                const float& scale_factor);
+
  private:
   scoped_ptr<PdfMetafileSkiaData> data_;
 
-  // True when finish page is outstanding for current page.
-  bool page_outstanding_;
-
   DISALLOW_COPY_AND_ASSIGN(PdfMetafileSkia);
 };
 
 }  // namespace printing
 
 #endif  // PRINTING_PDF_METAFILE_SKIA_H_