Make PluginInstance::PrintPDFOutput-metafile implementation agnostic on Linux.

printing/native_metafile_skia_wrapper.h

Index: printing/native_metafile_skia_wrapper.h
diff --git a/printing/native_metafile_skia_wrapper.h b/printing/native_metafile_skia_wrapper.h
new file mode 100644
index 0000000000000000000000000000000000000000..7eb2887eaf0012b8f4027276e0d0861f1810cc00
--- /dev/null
+++ b/printing/native_metafile_skia_wrapper.h
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+// Copyright (c) 2011 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_NATIVE_METAFILE_SKIA_WRAPPER_H_
+#define PRINTING_NATIVE_METAFILE_SKIA_WRAPPER_H_
+
+#include "third_party/skia/include/core/SkRefCnt.h"
+
+class SkCanvas;
+
+namespace printing {
+
+class NativeMetafile;
+
+// A wrapper class with static methods to set and retrieve a NativeMetafile
+// 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 NativeMetafileSkiaWrapper : public SkRefCnt {
+ public:
+  static void SetMetafileOnCanvas(SkCanvas* canvas, NativeMetafile* metafile);
+
+  static NativeMetafile* GetMetafileFromCanvas(SkCanvas* canvas);
+
+ private:
+  explicit NativeMetafileSkiaWrapper(NativeMetafile* metafile);
+
+  NativeMetafile* metafile_;
+};
+
+}  // namespace printing
+
+#endif  // PRINTING_NATIVE_METAFILE_SKIA_WRAPPER_H_