mac: Periodically shim new malloc zones immediately after startup.

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..68f1d53bb6094424a8a2b7c911aaec45e0c823da 100644
--- a/base/allocator/allocator_interception_mac.h
+++ b/base/allocator/allocator_interception_mac.h
@@ -8,6 +8,7 @@
 #include <stddef.h>
 
 #include "base/base_export.h"
+#include "third_party/apple_apsl/malloc.h"
 
 namespace base {
 namespace allocator {
@@ -40,6 +41,15 @@ BASE_EXPORT void InterceptAllocationsMac();
 // Also calls ClearAllMallocZonesForTesting.
 BASE_EXPORT void UninterceptMallocZonesForTesting();
 
+// Periodically checks for, and shims new malloc zones. Stops checking after 1
+// minute.
+BASE_EXPORT void PeriodicallyShimNewMallocZones();
+
+// Exposed for testing.
+BASE_EXPORT void ShimNewMallocZones();
+BASE_EXPORT void ReplaceZoneFunctions(ChromeMallocZone* zone,
+                                      const MallocZoneFunctions* functions);
+
 }  // namespace allocator
 }  // namespace base