Bug 1462784 - Annotate idle stacks in the native event loop on Linux. r=froydnj

MozReview-Commit-ID: 3Q2A7ytsn1Y

--HG--
extra : rebase_source : 83271e841a84fc2ac7a2fdd5cc66812fb09f61f1

widget/gtk/nsAppShell.cpp

@@ -49,6 +49,7 @@ PollWrapper(GPollFD *ufds, guint nfsd, gint timeout_)
     mozilla::HangMonitor::Suspend();
     gint result;
     {
+        AUTO_PROFILER_LABEL("PollWrapper", IDLE);
         AUTO_PROFILER_THREAD_SLEEP;
         result = (*sPollFunc)(ufds, nfsd, timeout_);
     }