Update to NSPR 4.10.2.

nspr/lib/ds/plarenas.h

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef PLARENAS_H
 #define PLARENAS_H
 
 PR_BEGIN_EXTERN_C
 
@@ skipping 29 matching lines @@
 PR_EXTERN(void) PL_FinishArenaPool(PLArenaPool *pool);
 
 /*
 ** Compact all of the arenas in a pool so that no space is wasted.
 ** NOT IMPLEMENTED.  Do not use.
 **/
 PR_EXTERN(void) PL_CompactArenaPool(PLArenaPool *pool);
 
 /*
 ** Friend functions used by the PL_ARENA_*() macros.
+**
+** WARNING: do not call these functions directly. Always use the
+** PL_ARENA_*() macros.
 **/
 PR_EXTERN(void *) PL_ArenaAllocate(PLArenaPool *pool, PRUint32 nb);
 
 PR_EXTERN(void *) PL_ArenaGrow(
     PLArenaPool *pool, void *p, PRUint32 size, PRUint32 incr);
 
 PR_EXTERN(void) PL_ArenaRelease(PLArenaPool *pool, char *mark);
 
 /*
 ** memset contents of all arenas in pool to pattern
 */
 PR_EXTERN(void) PL_ClearArenaPool(PLArenaPool *pool, PRInt32 pattern);
 
+/*
+** A function like malloc_size() or malloc_usable_size() that measures the
+** size of a heap block.
+*/
+typedef size_t (*PLMallocSizeFn)(const void *ptr);
+
+/*
+** Measure all memory used by a PLArenaPool, excluding the PLArenaPool
+** structure.
+*/
+PR_EXTERN(size_t) PL_SizeOfArenaPoolExcludingPool(
+    const PLArenaPool *pool, PLMallocSizeFn mallocSizeOf);
+
 PR_END_EXTERN_C
 
 #endif /* PLARENAS_H */