Add asADash entry point into SkPathEffect to allow extracting Dash info from PathEffects

include/effects/SkDashPathEffect.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDashPathEffect_DEFINED
 #define SkDashPathEffect_DEFINED
 
@@ skipping 31 matching lines @@
     }
     virtual ~SkDashPathEffect();
 
     virtual bool filterPath(SkPath* dst, const SkPath& src,
                             SkStrokeRec*, const SkRect*) const SK_OVERRIDE;
 
     virtual bool asPoints(PointData* results, const SkPath& src,
                           const SkStrokeRec&, const SkMatrix&,
                           const SkRect*) const SK_OVERRIDE;
 
+    virtual DashType asADash(DashInfo* info) const SK_OVERRIDE;
+
     virtual Factory getFactory() const SK_OVERRIDE;
 
     static SkFlattenable* CreateProc(SkReadBuffer&);
 
 protected:
     SkDashPathEffect(SkReadBuffer&);
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
 
 #ifdef SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS
 public:
 #endif
     SkDashPathEffect(const SkScalar intervals[], int count, SkScalar phase,
                      bool scaleToFit = false);
 
 private:
+    void setInternalMembers(SkScalar phase);
+
     SkScalar*   fIntervals;
     int32_t     fCount;
+    SkScalar    fPhase;
     // computed from phase
     SkScalar    fInitialDashLength;
     int32_t     fInitialDashIndex;
     SkScalar    fIntervalLength;
     bool        fScaleToFit;
 
     typedef SkPathEffect INHERITED;
 };
 
 #endif