Bug 1087410: Ensure that ChromeHang annotations don't break in e10s; r=jimm

xpcom/threads/HangMonitor.cpp

@@ -589,6 +589,9 @@ void
 RegisterAnnotator(Annotator& aAnnotator)
 {
 #ifdef REPORT_CHROME_HANGS
+  if (GeckoProcessType_Default != XRE_GetProcessType()) {
+    return;
+  }
   MonitorAutoLock lock(*gMonitor);
   MOZ_ASSERT(gAnnotators);
   gAnnotators->insert(&aAnnotator);
@@ -599,6 +602,9 @@ void
 UnregisterAnnotator(Annotator& aAnnotator)
 {
 #ifdef REPORT_CHROME_HANGS
+  if (GeckoProcessType_Default != XRE_GetProcessType()) {
+    return;
+  }
   MonitorAutoLock lock(*gMonitor);
   MOZ_ASSERT(gAnnotators);
   gAnnotators->erase(&aAnnotator);