[NOT TO COMMIT!] r109: Diff of the current tcmalloc from the original google-perftools r109.

third_party/tcmalloc/chromium/src/system-alloc.h

Index: third_party/tcmalloc/chromium/src/system-alloc.h
diff --git a/third_party/tcmalloc/chromium/src/system-alloc.h b/third_party/tcmalloc/chromium/src/system-alloc.h
index 487a36b67155b4e2003b0ccbf04849d3ed5c1755..0432b32ebd9f452a310ea3de33bf59ace812c7ad 100644
--- a/third_party/tcmalloc/chromium/src/system-alloc.h
+++ b/third_party/tcmalloc/chromium/src/system-alloc.h
@@ -71,7 +71,18 @@ extern void* TCMalloc_SystemAlloc(size_t bytes, size_t *actual_bytes,
 // be released, partial pages will not.)
 extern void TCMalloc_SystemRelease(void* start, size_t length);
 
+// Called to ressurect memory which has been previously released
+// to the system via TCMalloc_SystemRelease.  An attempt to
+// commit a page that is already committed does not cause this
+// function to fail.
+extern void TCMalloc_SystemCommit(void* start, size_t length);
+
+// Guards the first page in the supplied range of memory and returns the size
+// of the guard page. Will return 0 if a guard cannot be added to the page
+// (e.g. start is not aligned or size is not large enough).
+extern size_t TCMalloc_SystemAddGuard(void* start, size_t size);
+
 // The current system allocator.
 extern PERFTOOLS_DLL_DECL SysAllocator* sys_alloc;
 
-#endif /* TCMALLOC_SYSTEM_ALLOC_H__ */
+#endif /* TCMALLOC_SYSTEM_ALLOC_H_ */