Hook up allocator shim on mac.

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 87cbf4896e941178837efa0843f881369c36975b..694d66b34be23f32c8ea7217d4b9a75289441222 100644
--- a/base/allocator/allocator_interception_mac.h
+++ b/base/allocator/allocator_interception_mac.h
@@ -25,22 +25,38 @@ typedef void* (*realloc_type)(struct _malloc_zone_t* zone,
 typedef void* (*memalign_type)(struct _malloc_zone_t* zone,
                                size_t alignment,
                                size_t size);
+typedef unsigned (*batch_malloc_type)(struct _malloc_zone_t* zone,
+                                      size_t size,
+                                      void** results,
+                                      unsigned num_requested);
+typedef void (*batch_free_type)(struct _malloc_zone_t* zone,
+                                void** to_be_freed,
+                                unsigned num_to_be_freed);
+typedef void (*free_definite_size_type)(struct _malloc_zone_t* zone,
+                                        void* ptr,
+                                        size_t size);
+typedef size_t (*size_fn_type)(struct _malloc_zone_t* zone, const void* ptr);
 
 struct MallocZoneFunctions {
+  MallocZoneFunctions();
   malloc_type malloc = nullptr;
   calloc_type calloc = nullptr;
   valloc_type valloc = nullptr;
   free_type free = nullptr;
   realloc_type realloc = nullptr;
   memalign_type memalign = nullptr;
+  batch_malloc_type batch_malloc = nullptr;
+  batch_free_type batch_free = nullptr;
+  free_definite_size_type free_definite_size = nullptr;
+  size_fn_type size = nullptr;
 };
 
-// Saves the function pointers currently used by |zone| into |functions|.
-void StoreZoneFunctions(ChromeMallocZone* zone, MallocZoneFunctions* functions);
+// Saves the function pointers currently used by default zone into |functions|.
+void StoreFunctionsForDefaultZone(MallocZoneFunctions* functions);
 
-// Updates the malloc zone to use the functions specified by |functions|.
-void ReplaceZoneFunctions(ChromeMallocZone* zone,
-                          const MallocZoneFunctions* functions);
+// Updates the default malloc zone to use the functions specified by
+// |functions|.
+void ReplaceFunctionsForDefaultZone(const MallocZoneFunctions* functions);
 
 // Calls the original implementation of malloc/calloc prior to interception.
 bool UncheckedMallocMac(size_t size, void** result);
@@ -48,6 +64,8 @@ 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.
 void InterceptAllocationsMac();
 }  // namespace allocator
 }  // namespace base