Port most uses of SkOnce to SkLazyPtr.

src/core/SkPathRef.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBuffer.h"
-#include "SkOnce.h"
+#include "SkLazyPtr.h"
 #include "SkPath.h"
 #include "SkPathRef.h"
 
 //////////////////////////////////////////////////////////////////////////////
 SkPathRef::Editor::Editor(SkAutoTUnref<SkPathRef>* pathRef,
                           int incReserveVerbs,
                           int incReservePoints)
 {
     if ((*pathRef)->unique()) {
         (*pathRef)->incReserve(incReserveVerbs, incReservePoints);
     } else {
         SkPathRef* copy = SkNEW(SkPathRef);
         copy->copy(**pathRef, incReserveVerbs, incReservePoints);
         pathRef->reset(copy);
     }
     fPathRef = *pathRef;
     fPathRef->fGenerationID = 0;
     SkDEBUGCODE(sk_atomic_inc(&fPathRef->fEditorsAttached);)
 }
 
 //////////////////////////////////////////////////////////////////////////////
-static SkPathRef* gEmptyPathRef = NULL;
-static void cleanup_gEmptyPathRef() { gEmptyPathRef->unref(); }
 
-void SkPathRef::CreateEmptyImpl(int) {
-    gEmptyPathRef = SkNEW(SkPathRef);
-    gEmptyPathRef->computeBounds();  // Preemptively avoid a race to clear fBoundsIsDirty.
+SkPathRef* SkPathRef::CreateEmptyImpl() {
+    SkPathRef* p = SkNEW(SkPathRef);
+    p->computeBounds();   // Preemptively avoid a race to clear fBoundsIsDirty.
+    return p;
 }
 
 SkPathRef* SkPathRef::CreateEmpty() {
-    SK_DECLARE_STATIC_ONCE(once);
-    SkOnce(&once, SkPathRef::CreateEmptyImpl, 0, cleanup_gEmptyPathRef);
-    return SkRef(gEmptyPathRef);
+    SK_DECLARE_STATIC_LAZY_PTR(SkPathRef, empty, CreateEmptyImpl);
+    return SkRef(empty.get());
 }
 
 void SkPathRef::CreateTransformedCopy(SkAutoTUnref<SkPathRef>* dst,
                                       const SkPathRef& src,
                                       const SkMatrix& matrix) {
     SkDEBUGCODE(src.validate();)
     if (matrix.isIdentity()) {
         if (*dst != &src) {
             src.ref();
             dst->reset(const_cast<SkPathRef*>(&src));
@@ skipping 430 matching lines @@
                 break;
             default:
                 SkDEBUGFAIL("Unknown Verb");
                 break;
         }
     }
     SkASSERT(mask == fSegmentMask);
 #endif // SK_DEBUG_PATH
 }
 #endif