don't flip the fractional bits (low 4) for bilerp when in kMirror_TileMode
Review URL: https://codereview.appspot.com/5795043

git-svn-id: http://skia.googlecode.com/svn/trunk@3357 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkBitmapProcState.h b/src/core/SkBitmapProcState.h
index 7556042..8d18526 100644
--- a/src/core/SkBitmapProcState.h
+++ b/src/core/SkBitmapProcState.h
@@ -55,6 +55,7 @@
                                  uint16_t colors[]);
     
     typedef U16CPU (*FixedTileProc)(SkFixed);   // returns 0..0xFFFF
+    typedef U16CPU (*FixedTileLowBitsProc)(SkFixed, int);   // returns 0..0xF
     typedef U16CPU (*IntTileProc)(int value, int count);   // returns 0..count-1
 
     // If a shader proc is present, then the corresponding matrix/sample procs
@@ -75,6 +76,8 @@
     
     FixedTileProc       fTileProcX;         // chooseProcs
     FixedTileProc       fTileProcY;         // chooseProcs
+    FixedTileLowBitsProc fTileLowBitsProcX; // chooseProcs
+    FixedTileLowBitsProc fTileLowBitsProcY; // chooseProcs
     IntTileProc         fIntTileProcY;      // chooseProcs
     SkFixed             fFilterOneX;
     SkFixed             fFilterOneY;