Mac_mokey run_debug_test_android is 3.03% flaky

The post-submit test builder `Mac_mokey run_debug_test_android` had a flaky ratio 3.03% for the past (up to) 100 commits, which is above our 2.00% threshold.

One recent flaky example for a same commit: https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_debug_test_android/7800
Commit: https://github.com/flutter/flutter/commit/92a5797d83bd958001a0680b16fa11f076961b11

Flaky builds:
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_debug_test_android/7800
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_debug_test_android/7798
https://ci.chromium.org/ui/p/flutter/builders/prod/Mac_mokey%20run_debug_test_android/7746

Recent test runs:
https://flutter-dashboard.appspot.com/#/build?taskFilter=Mac_mokey%20run_debug_test_android

Please follow https://github.com/flutter/flutter/blob/master/docs/infra/Reducing-Test-Flakiness.md#fixing-flaky-tests to fix the flakiness and enable the test back after validating the fix (internal dashboard to validate: go/flutter_test_flakiness).

Start with docs/infra/Reducing-Test-Flakiness.md and inspect the linked Mac_mokey run_debug_test_android flaky builds and recent test runs. Identify the source of the flakiness, validate the fix using the referenced internal dashboard, and enable the test again once the flakiness is resolved.

Written by the indexing model from the issue text.