Bug 1488820 - [marionette] Check for crashes if no connection can be established in raise_for_port().

--HG--
extra : rebase_source : 02b2a2718f44589efe8f96553edb749ce5e00f17

testing/marionette/client/marionette_driver/marionette.py

@@ -722,6 +722,10 @@ class Marionette(object):
             time.sleep(poll_interval)
 
         if not connected:
+            # There might have been a startup crash of the application
+            if runner is not None and self.check_for_crash() > 0:
+                raise IOError('Process crashed (Exit code: {})'.format(runner.wait(0)))
+
             raise socket.timeout("Timed out waiting for connection on {0}:{1}!".format(
                 self.host, self.port))