Adds sync_integration_tests to linux-lacros-rel

Missing the test suite caused reverts. And we are currently getting
sync support Lacros, which makes this test suite very useful on CQ.
This is a medium sized test suite, runs ~5 mins. My rough calculation
is that we need 2 more bots to run the suite on CQ.
Checked the capacity:
https://monitoring.corp.google.com/dashboard/chrome_client%2Fbots?filters=bucket%3Dtry,project%3Dchromium,pool%3Dchromium.tests,os%3DUbuntu-16.04.6,cpu%3Dx86-64&scope=borg_user%3Dchrome-ops-client-infra&schema=2&cols=1&duration=86400&utc_end=&refresh=1800
Seems fine to just add it.

Bug: 1199175
Change-Id: I359c49571824206add37a95194c9902e32425513
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2832074
Commit-Queue: Sven Zheng <[email protected]>
Commit-Queue: Yuke Liao <[email protected]>
Reviewed-by: Yuke Liao <[email protected]>
Cr-Commit-Position: refs/heads/master@{#873506}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index a16754ab..c72696c8 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -2456,12 +2456,16 @@
           'shards': 4,
         },
       },
-      # https://crbug.com/1111979,
-      'linux-lacros-tester-rel': {
+      # https://crbug.com/1199909,
+      'linux-lacros-rel': {
         'args': [
-          '--gtest_filter=-SingleClientSessionsSyncTestWithFaviconTestServer.ShouldDeleteOnDemandIconsOnSessionsDisabled',
-        ],
-      },
+          '--gtest_filter=-SingleClientNigoriWithWebApiTest.ShoudRecordTrustedVaultErrorShownOnStartupWhenErrorNotShown:\
+SingleClientNigoriWithWebApiTest.ShouldAcceptEncryptionKeysFromTheWebBeforeSignIn:\
+SingleClientNigoriWithWebApiTest.ShouldClearEncryptionKeysFromTheWebWhenSigninCookiesCleared:\
+SingleClientPollingSyncTest.ShouldPollWhenIntervalExpiredAcrossRestarts:\
+SingleClientPollingSyncTest.ShouldUsePollIntervalFromPrefs',
+        ]
+      }
     },
   },
   'system_webview_shell_layout_test_apk': {