Use mach_override to intercept all newly registered malloc zones.

base/allocator/allocator_interception_mac.h

Index: base/allocator/allocator_interception_mac.h
diff --git a/base/allocator/allocator_interception_mac.h b/base/allocator/allocator_interception_mac.h
index 8867f3823180a9f890c3fb7190ea084a0c128b04..00e47a26a44791e87045d7a15adeb99257bb93fa 100644
--- a/base/allocator/allocator_interception_mac.h
+++ b/base/allocator/allocator_interception_mac.h
@@ -36,8 +36,13 @@ bool UncheckedCallocMac(size_t num_items, size_t size, void** result);
 // 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