Use mach_override to intercept all newly registered malloc zones.

base/allocator/allocator_interception_mac.h

 // Copyright 2017 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.
 
 #ifndef BASE_ALLOCATOR_ALLOCATOR_INTERCEPTION_MAC_H_
 #define BASE_ALLOCATOR_ALLOCATOR_INTERCEPTION_MAC_H_
 
 #include <stddef.h>
 
 #include "base/base_export.h"
@@ skipping 18 matching lines @@
 // Calls the original implementation of malloc/calloc prior to interception.
 bool UncheckedMallocMac(size_t size, void** result);
 bool UncheckedCallocMac(size_t num_items, size_t size, void** result);
 
 // Intercepts calls to default and purgeable malloc zones. Intercepts Core
 // Foundation and Objective-C allocations.
 // Has no effect on the default malloc zone if the allocator shim already
 // performs that interception.
 BASE_EXPORT void InterceptAllocationsMac();
 
+// Intercepts all future malloc zone registrations.
+BASE_EXPORT void InterceptNewlyRegisteredMallocZones(
+    const MallocZoneFunctions* functions);
+
 // Updates all malloc zones to use their original functions.
-// Also calls ClearAllMallocZonesForTesting.
+// Also calls ClearAllMallocZonesForTesting and
+// StopMallocZoneRegistrationInterceptionForTesting.
 BASE_EXPORT void UninterceptMallocZonesForTesting();
 
 }  // namespace allocator
 }  // namespace base
 
 #endif  // BASE_ALLOCATOR_ALLOCATOR_INTERCEPTION_MAC_H_