Modernize and trim down SkOnce.

src/effects/SkColorCubeFilter.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColorCubeFilter.h"
 #include "SkColorPriv.h"
 #include "SkOnce.h"
@@ skipping 49 matching lines @@
     : fCubeData(std::move(cubeData))
     , fUniqueID(SkNextColorCubeUniqueID())
     , fCache(cubeDimension)
 {}
 
 uint32_t SkColorCubeFilter::getFlags() const {
     return this->INHERITED::getFlags() | kAlphaUnchanged_Flag;
 }
 
 SkColorCubeFilter::ColorCubeProcesingCache::ColorCubeProcesingCache(int cubeDimension)
-  : fCubeDimension(cubeDimension)
-  , fLutsInited(false) {
+  : fCubeDimension(cubeDimension) {
     fColorToIndex[0] = fColorToIndex[1] = nullptr;
     fColorToFactors[0] = fColorToFactors[1] = nullptr;
     fColorToScalar = nullptr;
 }
 
 void SkColorCubeFilter::ColorCubeProcesingCache::getProcessingLuts(
     const int* (*colorToIndex)[2], const SkScalar* (*colorToFactors)[2],
     const SkScalar** colorToScalar) {
-    SkOnce(&fLutsInited, &fLutsMutex,
-           SkColorCubeFilter::ColorCubeProcesingCache::initProcessingLuts, this);
+    fLutsInitOnce(SkColorCubeFilter::ColorCubeProcesingCache::initProcessingLuts, this);
+
     SkASSERT((fColorToIndex[0] != nullptr) &&
              (fColorToIndex[1] != nullptr) &&
              (fColorToFactors[0] != nullptr) &&
              (fColorToFactors[1] != nullptr) &&
              (fColorToScalar != nullptr));
     (*colorToIndex)[0] = fColorToIndex[0];
     (*colorToIndex)[1] = fColorToIndex[1];
     (*colorToFactors)[0] = fColorToFactors[0];
     (*colorToFactors)[1] = fColorToFactors[1];
     (*colorToScalar) = fColorToScalar;
@@ skipping 228 matching lines @@
         if (textureCube) {
             context->textureProvider()->assignUniqueKeyToTexture(key, textureCube);
         } else {
             return nullptr;
         }
     }
 
     return GrColorCubeEffect::Create(textureCube);
 }
 #endif