Linux: inform the Zygote when it's waiting on a dead process

content/browser/zygote_host/zygote_host_impl_linux.h

Index: content/browser/zygote_host/zygote_host_impl_linux.h
diff --git a/content/browser/zygote_host/zygote_host_impl_linux.h b/content/browser/zygote_host/zygote_host_impl_linux.h
index 8a6c77823350c877481c1a55bac8c34bab36b542..18728402fb74a4d88565642788c8498d86012622 100644
--- a/content/browser/zygote_host/zygote_host_impl_linux.h
+++ b/content/browser/zygote_host/zygote_host_impl_linux.h
@@ -37,7 +37,12 @@ class CONTENT_EXPORT ZygoteHostImpl : public ZygoteHost {
   // Get the termination status (and, optionally, the exit code) of
   // the process. |exit_code| is set to the exit code of the child
   // process. (|exit_code| may be NULL.)
+  // Unfortunately the Zygote can not accurately figure out if a process
+  // is already dead without waiting synchronously for it.
+  // |known_dead| should be set to true when we already know that the process
+  // is dead.
   base::TerminationStatus GetTerminationStatus(base::ProcessHandle handle,
+                                               bool known_dead,
                                                int* exit_code);
 
   // ZygoteHost implementation: