don't preround in bitmap scaling setup

src/core/SkBitmapProcState.cpp

Index: src/core/SkBitmapProcState.cpp
diff --git a/src/core/SkBitmapProcState.cpp b/src/core/SkBitmapProcState.cpp
index b1438cb8a0400fadbddcaed31cadb70e0fe21966..d097d8ea2edefa21e053411c22caaec5f7688140 100644
--- a/src/core/SkBitmapProcState.cpp
+++ b/src/core/SkBitmapProcState.cpp
@@ -173,9 +173,13 @@ bool SkBitmapProcState::chooseProcs(const SkMatrix& inv, const SkPaint& paint) {
         if (fInvMatrix.invert(&forward)) {
             if (clampClamp ? just_trans_clamp(forward, fPixmap)
                            : just_trans_general(forward)) {
+#ifdef SK_SUPPORT_LEGACY_TRANSLATEROUNDHACK
                 SkScalar tx = -SkScalarRoundToScalar(forward.getTranslateX());
                 SkScalar ty = -SkScalarRoundToScalar(forward.getTranslateY());
                 fInvMatrix.setTranslate(tx, ty);
+#else
+                fInvMatrix.setTranslate(-forward.getTranslateX(), -forward.getTranslateY());
+#endif
             }
         }
     }