Fix race condition in overall_experience_test (#81091)

packages/flutter_tools/test/integration.shard/overall_experience_test.dart

@@ -331,13 +331,13 @@ void main() {
             processManager.killPid(pid, ProcessSignal.sigusr1);
             return null;
           }),
-          Barrier(RegExp(r'^Performing hot reload\.\.\.'), logging: true),
+          Barrier(RegExp(r'^Performing hot reload\.\.\.'), logging: true), // sometimes this includes the "called reassemble" message
           Multiple(<Pattern>[RegExp(r'^Reloaded 0 libraries in [0-9]+ms\.$'), /*'called reassemble', (see TODO below)*/ 'called paint'], handler: (String line) {
             processManager.killPid(pid, ProcessSignal.sigusr2);
             return null;
           }),
-          Barrier(RegExp(r'^Performing hot restart\.\.\.')),
-          Multiple(<Pattern>[RegExp(r'^Restarted application in [0-9]+ms.$'), 'called main', 'called paint'], handler: (String line) {
+          Barrier(RegExp(r'^Performing hot restart\.\.\.')), // sametimes this includes the "called main" message
+          Multiple(<Pattern>[RegExp(r'^Restarted application in [0-9]+ms.$'), /*'called main', (see TODO below)*/ 'called paint'], handler: (String line) {
             return 'q';
           }),
           const Barrier('Application finished.'),
@@ -349,13 +349,15 @@ void main() {
       // is verified by the expected transitions above.
       // TODO(ianh): Fix the tool so that the output isn't garbled (right now we're putting debug output from
       // the app on the line where we're spinning the busy signal, rather than adding a newline).
-      expect(result.stdout.where((String line) => line.startsWith('called ') && line != 'called reassemble' /* see todo above*/), <Object>[
+      expect(result.stdout.where((String line) => line.startsWith('called ') &&
+             line != 'called reassemble' /* see todo above*/ &&
+             line != 'called main' /* see todo above*/), <Object>[
         // logs start after we receive the response to sending SIGUSR1
         // SIGUSR1:
         // 'called reassemble', // see todo above, this only sometimes gets included, other times it's on the "performing..." line
         'called paint',
         // SIGUSR2:
-        'called main',
+        // 'called main', // see todo above, this is sometimes on the "performing..." line
         'called paint',
       ]);
       expect(result.stdout.where((String line) => !line.startsWith('called ')), <Object>[