port gn to aix

Change-Id: I3077efcd131c0f69377bb6dfa85f9a36852df3f1
Reviewed-on: https://gn-review.googlesource.com/2260
Reviewed-by: Brett Wilson <brettw@google.com>
Commit-Queue: Brett Wilson <brettw@google.com>
diff --git a/base/files/file_posix.cc b/base/files/file_posix.cc
index 977eb1b..4faf77b 100644
--- a/base/files/file_posix.cc
+++ b/base/files/file_posix.cc
@@ -100,6 +100,13 @@
   int64_t last_accessed_nsec = stat_info.st_atimespec.tv_nsec;
   time_t creation_time_sec = stat_info.st_ctimespec.tv_sec;
   int64_t creation_time_nsec = stat_info.st_ctimespec.tv_nsec;
+#elif defined(OS_AIX)
+  time_t last_modified_sec = stat_info.st_mtime;
+  int64_t last_modified_nsec = 0;
+  time_t last_accessed_sec = stat_info.st_atime;
+  int64_t last_accessed_nsec = 0;
+  time_t creation_time_sec = stat_info.st_ctime;
+  int64_t creation_time_nsec = 0;
 #else
 #error
 #endif