Report memory retained by memory allocator internals.

base/allocator/allocator_extension.h

Index: base/allocator/allocator_extension.h
diff --git a/base/allocator/allocator_extension.h b/base/allocator/allocator_extension.h
index dda0fd9dcfb40f6c53783a6a952ec428c4e5ab06..de3119f85e66609f9ad0f7c97a29f6d326993331 100644
--- a/base/allocator/allocator_extension.h
+++ b/base/allocator/allocator_extension.h
@@ -14,13 +14,14 @@
 namespace base {
 namespace allocator {
 
-// Request the allocator to report value of its internal state variable.
+// Request the allocator to report value of its waste memory size.
+// Waste size corresponds to memory that has been allocated from the OS but
+// not passed up to the application. It e.g. includes memory retained by free
+// lists, internal data, chunks padding, etc.
 //
-// |name| name of the variable
-// |value| pointer to the returned value, must be not NULL.
-// Returns true if the value has been returned, false if a variable with such
-// name does not exist.
-BASE_EXPORT bool GetProperty(const char* name, size_t* value);
+// |size| pointer to the returned value, must be not NULL.
+// Returns true if the value has been returned, false otherwise.
+BASE_EXPORT bool GetAllocatorWasteSize(size_t* size);
 
 // Request that the allocator print a human-readable description of the current
 // state of the allocator into a null-terminated string in the memory segment
@@ -43,8 +44,8 @@ BASE_EXPORT void ReleaseFreeMemory();
 // No threading promises are made.  The caller is responsible for making sure
 // these pointers are set before any other threads attempt to call the above
 // functions.
-BASE_EXPORT void SetGetPropertyFunction(
-    thunks::GetPropertyFunction get_property_function);
+BASE_EXPORT void SetGetAllocatorWasteSizeFunction(
+    thunks::GetAllocatorWasteSizeFunction get_allocator_waste_size_function);
 
 BASE_EXPORT void SetGetStatsFunction(
     thunks::GetStatsFunction get_stats_function);