Use a consume load in SkLazyPtr.

src/ports/SkBarriers_tsan.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBarriers_tsan_DEFINED
 #define SkBarriers_tsan_DEFINED
 
 static inline void sk_compiler_barrier() { asm volatile("" : : : "memory"); }
 
 template <typename T>
 T sk_acquire_load(T* ptr) {
     SkASSERT(__atomic_always_lock_free(sizeof(T), ptr));
     return __atomic_load_n(ptr, __ATOMIC_ACQUIRE);
 }
 
 template <typename T>
+T sk_consume_load(T* ptr) {
+    SkASSERT(__atomic_always_lock_free(sizeof(T), ptr));
+    return __atomic_load_n(ptr, __ATOMIC_CONSUME);
+}
+
+template <typename T>
 void sk_release_store(T* ptr, T val) {
     SkASSERT(__atomic_always_lock_free(sizeof(T), ptr));
     return __atomic_store_n(ptr, val, __ATOMIC_RELEASE);
 }
 
 #endif//SkBarriers_tsan_DEFINED