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 7f74e0b72c2fdcf5ec4906640557b0bc81b603be..282923bd002ed5f18736c2ce7d37560c8610a3f5 100644
--- a/base/process/process_posix.cc
+++ b/base/process/process_posix.cc
@@ -184,6 +184,7 @@ 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.
@@ -257,12 +258,12 @@ 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) {
@@ -366,7 +367,7 @@ 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());
@@ -380,7 +381,7 @@ 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());