Make skia::GetNativeDrawingContext Windows-only

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 43 matching lines @@
 
 // Draws the top layer of the canvas into the specified HDC. Only works
 // with a SkCanvas with a BitmapPlatformDevice. Will create a temporary
 // HDC to back the canvas if one doesn't already exist, tearing it down
 // before returning. If |src_rect| is null, copies the entire canvas.
 SK_API void DrawToNativeContext(SkCanvas* canvas,
                                 HDC hdc,
                                 int x,
                                 int y,
                                 const RECT* src_rect);
+
+// Returns the NativeDrawingContext to use for native platform drawing calls.
+SK_API HDC GetNativeDrawingContext(SkCanvas* canvas);
+
 #elif defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || \
       defined(__sun) || defined(ANDROID) || defined(__APPLE__)
   // Construct a canvas from the given memory region. The memory is not cleared
   // first. @data must be, at least, @height * StrideForWidth(@width) bytes.
 SK_API std::unique_ptr<SkCanvas> CreatePlatformCanvasWithPixels(
     int width,
     int height,
     bool is_opaque,
     uint8_t* data,
     OnFailureType failure_type);
@@ skipping 40 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);
 
-// Returns the NativeDrawingContext to use for native platform drawing calls.
-SK_API NativeDrawingContext GetNativeDrawingContext(SkCanvas* canvas);
-
 // 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_