Consolidate Windows bitmap and DC code

skia/ext/skia_utils_win.h

Index: skia/ext/skia_utils_win.h
diff --git a/skia/ext/skia_utils_win.h b/skia/ext/skia_utils_win.h
index 80cbe54b0e7b394ef565b2f90fddfeea0747856f..c738a63244598ead274cd0a4c89594a2f44cd68a 100644
--- a/skia/ext/skia_utils_win.h
+++ b/skia/ext/skia_utils_win.h
@@ -60,6 +60,13 @@ SK_API void LoadTransformToDC(HDC dc, const SkMatrix& matrix);
 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_