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

base/allocator/allocator_extension_thunks.cc

Index: base/allocator/allocator_extension_thunks.cc
diff --git a/base/allocator/allocator_extension_thunks.cc b/base/allocator/allocator_extension_thunks.cc
index e4024fb332e8d1edc4cff44bbcbb340c7c730f0a..8d0358db4b7f352dd99e49c128beda3c2aa144d2 100644
--- a/base/allocator/allocator_extension_thunks.cc
+++ b/base/allocator/allocator_extension_thunks.cc
@@ -20,6 +20,7 @@ namespace thunks {
 static GetAllocatorWasteSizeFunction g_get_allocator_waste_size_function = NULL;
 static GetStatsFunction g_get_stats_function = NULL;
 static ReleaseFreeMemoryFunction g_release_free_memory_function = NULL;
+static GetNumericPropertyFunction g_get_numeric_property_function = NULL;
 
 void SetGetAllocatorWasteSizeFunction(
     GetAllocatorWasteSizeFunction get_allocator_waste_size_function) {
@@ -47,6 +48,15 @@ ReleaseFreeMemoryFunction GetReleaseFreeMemoryFunction() {
   return g_release_free_memory_function;
 }
 
+void SetGetNumericPropertyFunction(
+    GetNumericPropertyFunction get_numeric_property_function) {
+  g_get_numeric_property_function = get_numeric_property_function;
+}
+
+GetNumericPropertyFunction GetGetNumericPropertyFunction() {
+  return g_get_numeric_property_function;
+}
+
 }  // namespace thunks
 }  // namespace allocator
 }  // namespace base