GN: aix port along with linux_s390x, linux_ppc64 and linux_ppc64le support.

base/process/process_metrics_posix.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/process/process_metrics.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <sys/resource.h>
@@ skipping 21 matching lines @@
 #elif defined(OS_SOLARIS)
 static const rlim_t kSystemDefaultMaxFds = 8192;
 #elif defined(OS_FREEBSD)
 static const rlim_t kSystemDefaultMaxFds = 8192;
 #elif defined(OS_NETBSD)
 static const rlim_t kSystemDefaultMaxFds = 1024;
 #elif defined(OS_OPENBSD)
 static const rlim_t kSystemDefaultMaxFds = 256;
 #elif defined(OS_ANDROID)
 static const rlim_t kSystemDefaultMaxFds = 1024;
+#elif defined(OS_AIX)
+static const rlim_t kSystemDefaultMaxFds = 8192;
 #endif
 
 size_t GetMaxFds() {
   rlim_t max_fds;
   struct rlimit nofile;
   if (getrlimit(RLIMIT_NOFILE, &nofile)) {
     // getrlimit failed. Take a best guess.
     max_fds = kSystemDefaultMaxFds;
     RAW_LOG(ERROR, "getrlimit(RLIMIT_NOFILE) failed");
   } else {
@@ skipping 21 matching lines @@
   } else {
     PLOG(INFO) << "Failed to get file descriptor limit";
   }
 }
 
 size_t GetPageSize() {
   return getpagesize();
 }
 
 }  // namespace base