Port uses of SkLazyPtr to SkOncePtr.

tests/LazyPtrTest.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 "Test.h"
-#include "SkLazyPtr.h"
-#include "SkRunnable.h"
-#include "SkTaskGroup.h"
-
-namespace {
-
-struct CreateIntFromFloat {
-    CreateIntFromFloat(float val) : fVal(val) {}
-    int* operator()() const { return new int((int)fVal); }
-    float fVal;
-};
-
-// As a template argument this must have external linkage.
-void custom_destroy(int* ptr) { *ptr = 99; }
-
-} // namespace
-
-DEF_TEST(LazyPtr, r) {
-    // Basic usage: calls new int.
-    SkLazyPtr<int> lazy;
-    int* ptr = lazy.get();
-    REPORTER_ASSERT(r, ptr);
-    REPORTER_ASSERT(r, lazy.get() == ptr);
-
-    // Advanced usage: calls a functor.
-    SkLazyPtr<int> lazyFunctor;
-    int* six = lazyFunctor.get(CreateIntFromFloat(6.4f));
-    REPORTER_ASSERT(r, six);
-    REPORTER_ASSERT(r, 6 == *six);
-
-    // Just makes sure this is safe.
-    SkLazyPtr<double> neverRead;
-
-    // SkLazyPtr supports custom destroy methods.
-    {
-        SkLazyPtr<int, custom_destroy> customDestroy;
-        ptr = customDestroy.get();
-        // custom_destroy called here.
-    }
-    REPORTER_ASSERT(r, ptr);
-    REPORTER_ASSERT(r, 99 == *ptr);
-    // Since custom_destroy didn't actually delete ptr, we do now.
-    delete ptr;
-}
-
-DEF_TEST(LazyPtr_Threaded, r) {
-    static const int kRacers = 321;
-
-    // Race to intialize the pointer by calling .get().
-    SkLazyPtr<int> lazy;
-    int* seen[kRacers];
-
-    sk_parallel_for(kRacers, [&](int i) {
-        seen[i] = lazy.get();
-    });
-
-    // lazy.get() should return the same pointer to all threads.
-    for (int i = 1; i < kRacers; i++) {
-        REPORTER_ASSERT(r, seen[i] != nullptr);
-        REPORTER_ASSERT(r, seen[i] == seen[0]);
-    }
-}