formalize named picture versions

src/effects/SkDashPathEffect.cpp

Index: src/effects/SkDashPathEffect.cpp
diff --git a/src/effects/SkDashPathEffect.cpp b/src/effects/SkDashPathEffect.cpp
index f6c7caecd94ee458eb2a0ff76bbc86bd304c0b68..4fd4185e06285efb5845423a288f0c449d084d2b 100644
--- a/src/effects/SkDashPathEffect.cpp
+++ b/src/effects/SkDashPathEffect.cpp
@@ -1,4 +1,3 @@
-
 /*
  * Copyright 2006 The Android Open Source Project
  *
@@ -6,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-
 #include "SkDashPathEffect.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ -544,7 +542,7 @@ SkFlattenable* SkDashPathEffect::CreateProc(SkReadBuffer& buffer) {
 }
 
 SkDashPathEffect::SkDashPathEffect(SkReadBuffer& buffer) : INHERITED(buffer) {
-    bool useOldPic = buffer.pictureVersion() < 25 && 0 != buffer.pictureVersion();
+    bool useOldPic = buffer.isVersionLT(SkReadBuffer::kDashWritesPhaseIntervals_Version);
     if (useOldPic) {
         fInitialDashIndex = buffer.readInt();
         fInitialDashLength = buffer.readScalar();