[counting_allocator] Chrome changes.

base/allocator/allocator_shim_override_cpp_symbols.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifdef BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_CPP_SYMBOLS_H_
 #error This header is meant to be included only once by allocator_shim.cc
 #endif
 #define BASE_ALLOCATOR_ALLOCATOR_SHIM_OVERRIDE_CPP_SYMBOLS_H_
 
 // Preempt the default new/delete C++ symbols so they call the shim entry
 // points. This file is strongly inspired by tcmalloc's
 // libc_override_redefine.h.
 
 #include <new>
 
 #include "base/allocator/allocator_shim_internals.h"
 
 SHIM_ALWAYS_EXPORT void* operator new(size_t size) {
   return ShimCppNew(size);
 }
 
+#if defined(_LIBCPP_COUNTING_ALLOCATOR)
+SHIM_ALWAYS_EXPORT void* operator new(size_t size, std::new_tag tag) {
+    return ShimTaggedCppNew(size, tag);
+}
+#endif
+
 SHIM_ALWAYS_EXPORT void operator delete(void* p) __THROW {
   ShimCppDelete(p);
 }
 
 SHIM_ALWAYS_EXPORT void* operator new[](size_t size) {
   return ShimCppNew(size);
 }
 
 SHIM_ALWAYS_EXPORT void operator delete[](void* p) __THROW {
   ShimCppDelete(p);
@@ skipping 10 matching lines @@
 }
 
 SHIM_ALWAYS_EXPORT void operator delete(void* p, const std::nothrow_t&) __THROW {
   ShimCppDelete(p);
 }
 
 SHIM_ALWAYS_EXPORT void operator delete[](void* p,
                                           const std::nothrow_t&) __THROW {
   ShimCppDelete(p);
 }