Report memory retained by memory allocator internals.

base/allocator/allocator_extension_thunks.h

Index: base/allocator/allocator_extension_thunks.h
diff --git a/base/allocator/allocator_extension_thunks.h b/base/allocator/allocator_extension_thunks.h
index 3b0e4edc088c276378ef2e1a274368e3431599da..1e97a84b63ce5a056e5a1394e8c301e2e38d9bdc 100644
--- a/base/allocator/allocator_extension_thunks.h
+++ b/base/allocator/allocator_extension_thunks.h
@@ -15,9 +15,10 @@ namespace thunks {
 // new allocator extension from a specific allocator implementation to base.
 // See allocator_extension.h to see the interface that base exports.
 
-typedef bool (*GetPropertyFunction)(const char* name, size_t* value);
-void SetGetPropertyFunction(GetPropertyFunction get_property_function);
-GetPropertyFunction GetGetPropertyFunction();
+typedef bool (*GetAllocatorWasteSizeFunction)(size_t* size);
+void SetGetAllocatorWasteSizeFunction(
+    GetAllocatorWasteSizeFunction get_allocator_waste_size_function);
+GetAllocatorWasteSizeFunction GetGetAllocatorWasteSizeFunction();
 
 typedef void (*GetStatsFunction)(char* buffer, int buffer_length);
 void SetGetStatsFunction(GetStatsFunction get_stats_function);