Move metafile printing code from platform canvas to PaintCanvas

skia/ext/platform_canvas.h

 // 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 SKIA_EXT_PLATFORM_CANVAS_H_
 #define SKIA_EXT_PLATFORM_CANVAS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 93 matching lines @@
 
 // Gives the pixmap passed in *writable* access to the pixels backing this
 // canvas. All writes to the pixmap should be visible if the canvas is
 // raster-backed.
 //
 // Returns false on failure: if either argument is nullptr, or if the
 // pixels can not be retrieved from the canvas. In the latter case resets
 // the pixmap to empty.
 SK_API bool GetWritablePixels(SkCanvas* canvas, SkPixmap* pixmap);
 
-// Following routines are used in print preview workflow to mark the
-// preview metafile.
-SK_API SkMetaData& GetMetaData(const SkCanvas& canvas);
-
-#if defined(OS_MACOSX)
-SK_API void SetIsPreviewMetafile(const SkCanvas& canvas, bool is_preview);
-SK_API bool IsPreviewMetafile(const SkCanvas& canvas);
-#endif
-
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_CANVAS_H_