[ios_runner]Added status for flaky tests

Example of full_results.json
"HistoryUITestCase/testSwipeDownDismissWhileSearching":
{"expected": "PASS", "is_flaky": true, "actual": "FAIL PASS"}
https://isolateserver.appspot.com/browse?namespace=default-gzip&digest=b152f5f5e3202ee123f81c8b7d912a850cc1ec48&as=full_results.json

Bug: 1032141
Change-Id: I24e7401d5f3a4e3a196dfbadcbd9953bfab39484
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013759
Commit-Queue: Maksym Onufriienko <monufriienko@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734719}

ios/build/bots/scripts/xcodebuild_runner.py

@@ -620,10 +620,32 @@ class SimulatorParallelTestRunner(test_runner.SimulatorTestRunner):
         'PASS': len(self.logs['passed tests']),
     }
     self.test_results['tests'] = collections.OrderedDict()
-    for test in self.logs['passed tests']:
-      self.test_results['tests'][test] = {'expected': 'PASS', 'actual': 'PASS'}
-    for test in self.logs['failed tests'] + self.logs['aborted tests']:
-      self.test_results['tests'][test] = {'expected': 'PASS', 'actual': 'FAIL'}
+
+    for shard_attempts in attempts_results:
+      for attempt, attempt_results in enumerate(shard_attempts):
+
+        for test in attempt_results['failed'].keys() + self.logs[
+            'aborted tests']:
+          if attempt == len(shard_attempts) - 1:
+            test_result = 'FAIL'
+          else:
+            test_result = self.test_results['tests'].get(test, {}).get(
+                'actual', '') + ' FAIL'
+          self.test_results['tests'][test] = {
+              'expected': 'PASS',
+              'actual': test_result.strip()
+          }
+
+        for test in attempt_results['passed']:
+          test_result = self.test_results['tests'].get(test, {}).get(
+              'actual', '') + ' PASS'
+          self.test_results['tests'][test] = {
+              'expected': 'PASS',
+              'actual': test_result.strip()
+          }
+          if 'FAIL' in test_result:
+            self.test_results['tests'][test]['is_flaky'] = True
+
     # Test is failed if there are failures for the last run.
     return not self.logs['failed tests']