Port most uses of SkOnce to SkLazyPtr.

include/core/SkPathRef.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPathRef_DEFINED
 #define SkPathRef_DEFINED
@@ skipping 400 matching lines @@
      */
     size_t currSize() const {
         return reinterpret_cast<intptr_t>(fVerbs) - reinterpret_cast<intptr_t>(fPoints);
     }
 
     SkDEBUGCODE(void validate() const;)
 
     /**
      * Called the first time someone calls CreateEmpty to actually create the singleton.
      */
-    static void CreateEmptyImpl(int/*unused*/);
+    static SkPathRef* CreateEmptyImpl();
 
     void setIsOval(bool isOval) { fIsOval = isOval; }
 
     SkPoint* getPoints() {
         SkDEBUGCODE(this->validate();)
         fIsOval = false;
         return fPoints;
     }
 
     enum {
@@ skipping 17 matching lines @@
         kEmptyGenID = 1, // GenID reserved for path ref with zero points and zero verbs.
     };
     mutable uint32_t    fGenerationID;
     SkDEBUGCODE(int32_t fEditorsAttached;) // assert that only one editor in use at any time.
 
     friend class PathRefTest_Private;
     typedef SkRefCnt INHERITED;
 };
 
 #endif