Allow backgrounding processes on Mac

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 4e6840a7bf374b2cd1b97b0a3dc987b555cffd12..97f3a6d416721c3bc2143044269dc1c648d49307 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -2804,8 +2804,14 @@ void RenderProcessHostImpl::OnProcessLaunched() {
     // Not all platforms launch processes in the same backgrounded state. Make
     // sure |is_process_backgrounded_| reflects this platform's initial process
     // state.
+#if defined(OS_MACOSX)
+    is_process_backgrounded_ =
+        child_process_launcher_->GetProcess().IsProcessBackgrounded(
+            MachBroker::GetInstance());
+#else
     is_process_backgrounded_ =
         child_process_launcher_->GetProcess().IsProcessBackgrounded();
+#endif  // defined(OS_MACOSX)
 
     // Disable updating process priority on startup for now as it incorrectly
     // results in backgrounding foreground navigations until their first commit