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

src/effects/SkDashPathEffect.cpp

Index: src/effects/SkDashPathEffect.cpp
diff --git a/src/effects/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index 58706c5b78f52d55bbead6d4f7a8f3634bd838c6..9dc2423a35ce1cd12a4132e7e154ec460c6649bc 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -529,6 +529,26 @@ bool SkDashPathEffect::asPoints(PointData* results,
     return true;
 }
 
+SkPathEffect::DashType SkDashPathEffect::asADash(DashInfo* info) const {
+    if (info) {
+       if (info->fCount >= fCount) {
+            if (info->fIntervals) {
+                memcpy(info->fIntervals, fIntervals, fCount * sizeof(SkScalar));
+            }
+       }
+       info->fCount = fCount;
+       info->fInitialDashLength = fInitialDashLength;
+       info->fInitialDashIndex = fInitialDashIndex;
+       info->fIntervalLength = fIntervalLength;
+       info->fScaleToFit = fScaleToFit;
+    }
+    if (2 == fCount) {
+        return kTwoInterval_DashType;
+    } else {
+        return kMultipleInterval_DashType;
+    }
+}
+
 SkFlattenable::Factory SkDashPathEffect::getFactory() const {
     return CreateProc;
 }