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/gm/tilemodes.cpp b/gm/tilemodes.cpp
index 8dc54a9..193f8a6 100644
--- a/gm/tilemodes.cpp
+++ b/gm/tilemodes.cpp
@@ -38,7 +38,7 @@
                   SkShader::TileMode tmx, SkShader::TileMode tmy) {
     SkShader* shader = SkShader::CreateBitmapShader(bm, tmx, tmy);
     paint->setShader(shader)->unref();
-    paint->setFilterLevel(filter ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel);
+    paint->setFilterQuality(filter ? kLow_SkFilterQuality : kNone_SkFilterQuality);
 }
 
 static const SkColorType gColorTypes[] = {