Revert of SkOncePtr -> SkOnce

src/ports/SkFontHost_mac.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 "SkTypes.h"  // Keep this before any #ifdef ...
 #if defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)
 
@@ skipping 17 matching lines @@
 #include "SkFontDescriptor.h"
 #include "SkFontMgr.h"
 #include "SkGlyph.h"
 #include "SkMaskGamma.h"
 #include "SkMutex.h"
 #include "SkOTTable_glyf.h"
 #include "SkOTTable_head.h"
 #include "SkOTTable_hhea.h"
 #include "SkOTTable_loca.h"
 #include "SkOTUtils.h"
-#include "SkOnce.h"
+#include "SkOncePtr.h"
 #include "SkPaint.h"
 #include "SkPath.h"
 #include "SkSFNTHeader.h"
 #include "SkStream.h"
 #include "SkString.h"
 #include "SkTemplates.h"
 #include "SkTypefaceCache.h"
 #include "SkTypeface_mac.h"
 #include "SkUtils.h"
 #include "SkUtils.h"
@@ skipping 722 matching lines @@
 
 typedef decltype(legacy_CTFontDrawGlyphs) CTFontDrawGlyphsProc;
 
 static CTFontDrawGlyphsProc* choose_CTFontDrawGlyphs() {
     if (void* real = dlsym(RTLD_DEFAULT, "CTFontDrawGlyphs")) {
         return (CTFontDrawGlyphsProc*)real;
     }
     return &legacy_CTFontDrawGlyphs;
 }
 
+SK_DECLARE_STATIC_ONCE_PTR(CTFontDrawGlyphsProc, gCTFontDrawGlyphs);
+
 CGRGBPixel* Offscreen::getCG(const SkScalerContext_Mac& context, const SkGlyph& glyph,
                              CGGlyph glyphID, size_t* rowBytesPtr,
                              bool generateA8FromLCD) {
-    static SkOnce once;
-    static CTFontDrawGlyphsProc* ctFontDrawGlyphs;
-    once([]{ ctFontDrawGlyphs = choose_CTFontDrawGlyphs(); });
+    auto ctFontDrawGlyphs = gCTFontDrawGlyphs.get(choose_CTFontDrawGlyphs);
 
     if (!fRGBSpace) {
         //It doesn't appear to matter what color space is specified.
         //Regular blends and antialiased text are always (s*a + d*(1-a))
         //and smoothed text is always g=2.0.
         fRGBSpace.reset(CGColorSpaceCreateDeviceRGB());
     }
 
     // default to kBW_Format
     bool doAA = false;
@@ skipping 1778 matching lines @@
 
         return SkSafeRef(GetDefaultFace());
     }
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkFontMgr* SkFontMgr::Factory() { return new SkFontMgr_Mac; }
 
 #endif//defined(SK_BUILD_FOR_MAC) || defined(SK_BUILD_FOR_IOS)