Use medium filtering when downscaling bitmap glyphs in FreeType host

src/ports/SkFontHost_FreeType_common.cpp

Index: src/ports/SkFontHost_FreeType_common.cpp
diff --git a/src/ports/SkFontHost_FreeType_common.cpp b/src/ports/SkFontHost_FreeType_common.cpp
index b27ae96fff28ab850a8cd3d5b4d43055846987c2..b53f9e3bf87f275097c7a2edfe67d1e33dab9ffa 100644
--- a/src/ports/SkFontHost_FreeType_common.cpp
+++ b/src/ports/SkFontHost_FreeType_common.cpp
@@ -463,7 +463,7 @@ void SkScalerContext_FreeType_Base::generateGlyphImage(FT_Face face, const SkGly
             canvas.scale(SkIntToScalar(glyph.fWidth) / SkIntToScalar(face->glyph->bitmap.width),
                          SkIntToScalar(glyph.fHeight) / SkIntToScalar(face->glyph->bitmap.rows));
             SkPaint paint;
-            paint.setFilterLevel(SkPaint::kLow_FilterLevel);
+            paint.setFilterLevel(SkPaint::kMedium_FilterLevel);
             canvas.drawBitmap(unscaledBitmap, 0, 0, &paint);
 
             // If the destination is BW or LCD, convert from A8.