Consolidate Windows bitmap and DC code

skia/ext/skia_utils_win.h

 // Copyright (c) 2006-2008 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_SKIA_UTILS_WIN_H_
 #define SKIA_EXT_SKIA_UTILS_WIN_H_
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "third_party/skia/include/core/SkMatrix.h"
 
@@ skipping 42 matching lines @@
 // Converts scale, skew, and translation to Windows format and sets it on the
 // HDC.
 SK_API void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
 
 // Copies |src_rect| from source into destination.
 //   Takes a potentially-slower path if |is_opaque| is false.
 //   Sets |transform| on source afterwards!
 SK_API void CopyHDC(HDC source, HDC destination, int x, int y, bool is_opaque,
                     const RECT& src_rect, const SkMatrix& transform);
 
+// Fills in a BITMAPINFOHEADER structure given the bitmap's size.
+SK_API void CreateBitmapHeader(int width, int height, BITMAPINFOHEADER* hdr);
+
+SK_API HBITMAP CreateHBitmap(int width, int height,
+                             HANDLE shared_section = nullptr,
+                             void** data = nullptr);
+
 }  // namespace skia
 
 #endif  // SKIA_EXT_SKIA_UTILS_WIN_H_