stop using bitmap-filter flags outside of paint itself, as a step towards really changing them into…

gm/filterbitmap.cpp

Index: gm/filterbitmap.cpp
diff --git a/gm/filterbitmap.cpp b/gm/filterbitmap.cpp
index 0afcb951018847528adb76e8c61413aff8d0ace1..4a1b89e4372edc6bd7649a556d79c1c988766c3f 100644
--- a/gm/filterbitmap.cpp
+++ b/gm/filterbitmap.cpp
@@ -31,11 +31,11 @@ static void draw_col(SkCanvas* canvas, const SkBitmap& bm, const SkMatrix& mat,
 
     canvas->drawBitmapMatrix(bm, mat, &paint);
 
-    paint.setFilterBitmap(true);
+    paint.setFilterLevel(SkPaint::kLow_FilterLevel);
     canvas->translate(dx, 0);
     canvas->drawBitmapMatrix(bm, mat, &paint);
 
-    paint.setFlags(paint.getFlags() | SkPaint::kHighQualityFilterBitmap_Flag);
+    paint.setFilterLevel(SkPaint::kHigh_FilterLevel);
     canvas->translate(dx, 0);
     canvas->drawBitmapMatrix(bm, mat, &paint);
 }