e.g.

https://build.chromium.org/p/chromium.linux/builders/Android%20GN/builds/33878
https://build.chromium.org/p/chromium.linux/builders/Android%20GN/builds/33889

nothing relevant in stdio
interestingly, logcat says it passes, indicating that this might be a test runner issue:

86d60:  04-20 16:34:37.119 11518 11539 I TestRunner: started: testToggleAccountSyncFromApplication(org.chromium.sync.AndroidSyncSettingsTest)
86d60:  04-20 16:34:37.119   798 30337 I PackageManager:   Action: "android.intent.action.SENDTO"
86d60:  04-20 16:34:37.119   798 30337 I PackageManager:   Category: "android.intent.category.DEFAULT"
86d60:  04-20 16:34:37.119   798 30337 I PackageManager:   Scheme: "mmsto"
86d60:  04-20 16:34:37.119   798 30337 I PackageManager: Adding preferred activity ComponentInfo{com.google.android.talk/com.google.android.apps.babel.phone.BabelHomeActivity} for user 0 :
86d60:  04-20 16:34:37.149 11518 11539 D dalvikvm: GC_EXPLICIT freed 261K, 2% free 16794K/17088K, paused 2ms+2ms, total 21ms
86d60:  04-20 16:34:37.159 11079 11079 V GelStubAppWatcher: onReceive: android.intent.action.PACKAGE_CHANGED
86d60:  04-20 16:34:37.159   798  7027 I ActivityManager: Resuming delayed broadcast
86d60:  04-20 16:34:37.169 11518 11539 D dalvikvm: GC_EXPLICIT freed 2K, 2% free 16792K/17088K, paused 1ms+2ms, total 15ms
86d60:  04-20 16:34:37.169 11518 11539 I TestRunner: finished: testToggleAccountSyncFromApplication(org.chromium.sync.AndroidSyncSettingsTest)
86d60:  04-20 16:34:37.169 11518 11539 I TestRunner: passed: testToggleAccountSyncFromApplication(org.chromium.sync.AndroidSyncSettingsTest)