Hid large dashed line optimization behind compiler flag

https://codereview.appspot.com/7133078/



git-svn-id: http://skia.googlecode.com/svn/trunk@7391 2bbb7eff-a529-9590-31e7-b0007b416f81

src/effects/SkDashPathEffect.cpp

@@ -230,6 +230,11 @@ private:
 
 bool SkDashPathEffect::filterPath(SkPath* dst, const SkPath& src,
                               SkStrokeRec* rec, const SkRect* cullRect) const {
+
+#ifdef SK_IGNORE_LARGE_DASH_OPT
+    cullRect = NULL;
+#endif
+
     // we do nothing if the src wants to be filled, or if our dashlength is 0
     if (rec->isFillStyle() || fInitialDashLength < 0) {
         return false;