Add missing includes.

Change-Id: I81e1b647f6909f0c85a67094e4fbc1198bf65516
Exempt-From-Owner-Approval: trivial cleanup
Test: mma
Bug: None
diff --git a/gralloc960/gralloc_module_ion.cpp b/gralloc960/gralloc_module_ion.cpp
index d91902c..db50d00 100644
--- a/gralloc960/gralloc_module_ion.cpp
+++ b/gralloc960/gralloc_module_ion.cpp
@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <pthread.h>
+#include <string.h>
 
 #include <cutils/log.h>
 #include <cutils/atomic.h>