SkPaint::FilterLevel -> SkFilterQuality

clone (+rebase) of https://codereview.chromium.org/1009183002/

BUG=skia:
TBR=scroggo@google.com

Review URL: https://codereview.chromium.org/1014533004
diff --git a/samplecode/SampleSlides.cpp b/samplecode/SampleSlides.cpp
index e115235..b626cdb 100644
--- a/samplecode/SampleSlides.cpp
+++ b/samplecode/SampleSlides.cpp
@@ -438,7 +438,7 @@
 
     SkPaint paint;
     paint.setDither(true);
-    paint.setFilterLevel(SkPaint::kLow_FilterLevel);
+    paint.setFilterQuality(kLow_SkFilterQuality);
 
     for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
         canvas->save();