Fix Dash Effect readback calc for fPhase from old skps

src/effects/SkDashPathEffect.cpp

 
 /*
  * 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.
  */
 
 
 #include "SkDashPathEffect.h"
@@ skipping 550 matching lines @@
         buffer.readScalarArray(fIntervals, fCount);
     } else {
         fIntervals = NULL;
     }
 
     if (useOldPic) {
         fPhase = 0;
         for (int i = 0; i < fInitialDashIndex; ++i) {
             fPhase += fIntervals[i];
         }
-        fPhase += fInitialDashLength;
+        fPhase += fIntervals[fInitialDashIndex] - fInitialDashLength;
     } else {
         this->setInternalMembers(fPhase);
     }
 }