DirectWrite to use aliased if ClearType is empty.

src/ports/SkScalerContext_win_dw.h

Index: src/ports/SkScalerContext_win_dw.h
diff --git a/src/ports/SkScalerContext_win_dw.h b/src/ports/SkScalerContext_win_dw.h
index e8eff0d6ce91f15d60005a49da63dea7878975b6..40686f191b754244f3c5af0a8438acb4348ab3b5 100644
--- a/src/ports/SkScalerContext_win_dw.h
+++ b/src/ports/SkScalerContext_win_dw.h
@@ -35,6 +35,11 @@ protected:
 private:
     const void* drawDWMask(const SkGlyph& glyph);
 
+    void getBoundingBox(SkGlyph* glyph,
+                        DWRITE_RENDERING_MODE renderingMode,
+                        DWRITE_TEXTURE_TYPE textureType,
+                        RECT* bbox);
+
     SkTDArray<uint8_t> fBits;
     /** The total matrix without the text height scale. */
     SkMatrix fSkXform;