Start hiding deprecated skia/ext/ functions

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 94 matching lines @@
                                               bool is_opaque) {
   return CreatePlatformCanvas(width, height, is_opaque, 0,
                               RETURN_NULL_ON_FAILURE);
 }
 
 // Return the stride (length of a line in bytes) for the given width. Because
 // we use 32-bits per pixel, this will be roughly 4*width. However, for
 // alignment reasons we may wish to increase that.
 SK_API size_t PlatformCanvasStrideForWidth(unsigned width);
 
-// Returns the SkBaseDevice pointer of the topmost rect with a non-empty
-// clip. In practice, this is usually either the top layer or nothing, since
-// we usually set the clip to new layers when we make them.
-//
-// This may return NULL, so callers need to check.
-//
-// This is different than SkCanvas' getDevice, because that returns the
-// bottommost device.
-//
-// Danger: the resulting device should not be saved. It will be invalidated
-// by the next call to save() or restore().
-SK_API SkBaseDevice* GetTopDevice(const SkCanvas& canvas);
-
 // Copies pixels from the SkCanvas into an SkBitmap, fetching pixels from
 // GPU memory if necessary.
 //
 // The bitmap will remain empty if we can't allocate enough memory for a copy
 // of the pixels.
 SK_API SkBitmap ReadPixels(SkCanvas* canvas);
 
 // 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.
@@ skipping 36 matching lines @@
 SK_API bool IsPreviewMetafile(const SkCanvas& canvas);
 
 // Returns the CGContext that backing the SkCanvas.
 // Returns NULL if none is bound.
 SK_API CGContextRef GetBitmapContext(const SkCanvas& canvas);
 #endif
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_PLATFORM_CANVAS_H_