Skia Filter Quality and Scaling Metrics

include/core/SkFilterQuality.h

Index: include/core/SkFilterQuality.h
diff --git a/include/core/SkFilterQuality.h b/include/core/SkFilterQuality.h
index db0597e697dd045d917169f42e1fe8498b87a907..54fae51fe19e1abc082c405ac68f635cfda0232f 100644
--- a/include/core/SkFilterQuality.h
+++ b/include/core/SkFilterQuality.h
@@ -18,7 +18,9 @@ enum SkFilterQuality {
     kNone_SkFilterQuality,      //!< fastest but lowest quality, typically nearest-neighbor
     kLow_SkFilterQuality,       //!< typically bilerp
     kMedium_SkFilterQuality,    //!< typically bilerp + mipmaps for down-scaling
-    kHigh_SkFilterQuality       //!< slowest but highest quality, typically bicubic or better
+    kHigh_SkFilterQuality,      //!< slowest but highest quality, typically bicubic or better
+
+    kLast_SkFilterQuality = kHigh_SkFilterQuality
 };
 
 #endif