[Findit] Extract failed output nodes from stdio log of compile step.

appengine/findit/waterfall/try_job_util.py

Index: appengine/findit/waterfall/try_job_util.py
diff --git a/appengine/findit/waterfall/try_job_util.py b/appengine/findit/waterfall/try_job_util.py
index 7273548b062a647cf0164c986d2f3ef8abcd2f86..f0bdeb796804c9db2b7a71ff4c2d959a3167ca1b 100644
--- a/appengine/findit/waterfall/try_job_util.py
+++ b/appengine/findit/waterfall/try_job_util.py
@@ -119,6 +119,9 @@ def _GetFailedTargetsFromSignals(signals, master_name, builder_name):
   if not signals or 'compile' not in signals:
     return compile_targets
 
+  if signals['compile'].get('failed_output_nodes'):
+    return signals['compile'].get('failed_output_nodes')
+
   strict_regex = waterfall_config.EnableStrictRegexForCompileLinkFailures(
       master_name, builder_name)
   for source_target in signals['compile'].get('failed_targets', []):