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

BUG=

Review URL: https://codereview.chromium.org/19825002

git-svn-id: http://skia.googlecode.com/svn/trunk@10240 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkBitmapProcState.h b/src/core/SkBitmapProcState.h
index b4fae04..349194f 100644
--- a/src/core/SkBitmapProcState.h
+++ b/src/core/SkBitmapProcState.h
@@ -89,12 +89,7 @@
     uint8_t             fInvType;           // chooseProcs
     uint8_t             fTileModeX;         // CONSTRUCTOR
     uint8_t             fTileModeY;         // CONSTRUCTOR
-
-    enum {
-        kNone_BitmapFilter,
-        kBilerp_BitmapFilter,
-        kHQ_BitmapFilter
-    } fFilterQuality;          // chooseProcs
+    uint8_t             fFilterLevel;       // chooseProcs
 
     /** The shader will let us know when we can release some of our resources
       * like scaled bitmaps.