Use SkAtomics_sync on Android

src/ports/SkAtomics_android.h

-/*
- * Copyright 2013 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkAtomics_android_DEFINED
-#define SkAtomics_android_DEFINED
-
-/** Android framework atomics. */
-
-#include <cutils/atomic.h>
-#include <stdint.h>
-
-static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) {
-    return android_atomic_inc(addr);
-}
-
-static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
-    return android_atomic_add(inc, addr);
-}
-
-static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) {
-    return android_atomic_dec(addr);
-}
-
-static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() {
-    //HACK: Android is actually using full memory barriers.
-    //      Should this change, uncomment below.
-    //int dummy;
-    //android_atomic_acquire_store(0, &dummy);
-}
-
-static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr,
-                                                                 int32_t before,
-                                                                 int32_t after) {
-    // android_atomic_release_cas returns 0 for success (if *addr == before and it wrote after).
-    return android_atomic_release_cas(before, after, addr) == 0;
-}
-
-static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() {
-    //HACK: Android is actually using full memory barriers.
-    //      Should this change, uncomment below.
-    //int dummy;
-    //android_atomic_acquire_store(0, &dummy);
-}
-
-#endif