[tracing] Fix resident size of malloc dump provider when tcmalloc is used

base/allocator/allocator_extension_thunks.h

 // Copyright (c) 2012 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_EXTENSION_THUNKS_H_
 #define BASE_ALLOCATOR_ALLOCATOR_EXTENSION_THUNKS_H_
 
 #include <stddef.h> // for size_t
 
 namespace base {
@@ skipping 11 matching lines @@
 
 typedef void (*GetStatsFunction)(char* buffer, int buffer_length);
 void SetGetStatsFunction(GetStatsFunction get_stats_function);
 GetStatsFunction GetGetStatsFunction();
 
 typedef void (*ReleaseFreeMemoryFunction)();
 void SetReleaseFreeMemoryFunction(
     ReleaseFreeMemoryFunction release_free_memory_function);
 ReleaseFreeMemoryFunction GetReleaseFreeMemoryFunction();
 
+typedef bool (*GetNumericPropertyFunction)(const char* name, size_t* value);
+void SetGetNumericPropertyFunction(
+    GetNumericPropertyFunction get_numeric_property_function);
+GetNumericPropertyFunction GetGetNumericPropertyFunction();
+
 }  // namespace thunks
 }  // namespace allocator
 }  // namespace base
 
 #endif  // BASE_ALLOCATOR_ALLOCATOR_EXTENSION_THUNKS_H_