Expose memory allocator internal stats and properties.

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 4a46b450dbd5e04d64aee9129837f5ef93841e7d..3b0e4edc088c276378ef2e1a274368e3431599da 100644
--- a/base/allocator/allocator_extension_thunks.h
+++ b/base/allocator/allocator_extension_thunks.h
@@ -5,6 +5,8 @@
 #ifndef BASE_ALLOCATOR_ALLOCATOR_THUNKS_EXTENSION_H
 #define BASE_ALLOCATOR_ALLOCATOR_THUNKS_EXTENSION_H
 
+#include <stddef.h> // for size_t
+
 namespace base {
 namespace allocator {
 namespace thunks {
@@ -13,14 +15,18 @@ namespace thunks {
 // new allocator extension from a specific allocator implementation to base.
 // See allocator_extension.h to see the interface that base exports.
 
-typedef void GetStatsFunction(char*, int);
-void SetGetStatsFunction(GetStatsFunction* get_stats_function);
-GetStatsFunction* GetGetStatsFunction();
+typedef bool (*GetPropertyFunction)(const char* name, size_t* value);
+void SetGetPropertyFunction(GetPropertyFunction get_property_function);
+GetPropertyFunction GetGetPropertyFunction();
+
+typedef void (*GetStatsFunction)(char* buffer, int buffer_length);
+void SetGetStatsFunction(GetStatsFunction get_stats_function);
+GetStatsFunction GetGetStatsFunction();
 
-typedef void ReleaseFreeMemoryFunction();
+typedef void (*ReleaseFreeMemoryFunction)();
 void SetReleaseFreeMemoryFunction(
-    ReleaseFreeMemoryFunction* release_free_memory_function);
-ReleaseFreeMemoryFunction* GetReleaseFreeMemoryFunction();
+    ReleaseFreeMemoryFunction release_free_memory_function);
+ReleaseFreeMemoryFunction GetReleaseFreeMemoryFunction();
 
 }  // namespace thunks
 }  // namespace allocator