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

base/process/process_posix.cc

Index: base/process/process_posix.cc
diff --git a/base/process/process_posix.cc b/base/process/process_posix.cc
index bbb342c4cf49a4b6c9072faacf5e6df78f384140..2fb708d2b47841363ea599c8ab98d7107e9d3f77 100644
--- a/base/process/process_posix.cc
+++ b/base/process/process_posix.cc
@@ -183,6 +183,7 @@ bool WaitForExitWithTimeoutImpl(base::ProcessHandle handle,
                                 base::TimeDelta timeout) {
   base::ProcessHandle parent_pid = base::GetParentProcessId(handle);
   base::ProcessHandle our_pid = base::GetCurrentProcessHandle();
+
   if (parent_pid != our_pid) {
 #if defined(OS_MACOSX)
     // On Mac we can wait on non child processes.
@@ -256,12 +257,12 @@ Process Process::DeprecatedGetProcessFromHandle(ProcessHandle handle) {
   return Process(handle);
 }
 
-#if !defined(OS_LINUX) && !defined(OS_MACOSX)
+#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_AIX)
 // static
 bool Process::CanBackgroundProcesses() {
   return false;
 }
-#endif  // !defined(OS_LINUX) && !defined(OS_MACOSX)
+#endif  // !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_AIX)
 
 // static
 void Process::TerminateCurrentProcessImmediately(int exit_code) {
@@ -365,7 +366,7 @@ bool Process::WaitForExitWithTimeout(TimeDelta timeout, int* exit_code) const {
   return WaitForExitWithTimeoutImpl(Handle(), exit_code, timeout);
 }
 
-#if !defined(OS_LINUX) && !defined(OS_MACOSX)
+#if !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_AIX)
 bool Process::IsProcessBackgrounded() const {
   // See SetProcessBackgrounded().
   DCHECK(IsValid());
@@ -379,7 +380,7 @@ bool Process::SetProcessBackgrounded(bool value) {
   NOTIMPLEMENTED();
   return false;
 }
-#endif  // !defined(OS_LINUX) && !defined(OS_MACOSX)
+#endif  // !defined(OS_LINUX) && !defined(OS_MACOSX) && !defined(OS_AIX)
 
 int Process::GetPriority() const {
   DCHECK(IsValid());