Repro steps:
1. Open attached project
2. Build and Run on Android
3. Press the Quit button

Actual: There's a "ActivityManager: Activity pause timeout for ActivityRecord" warning in the log

Reproducible with: 2017.4.0f1, 2017.4.37f1, 2018.4.18f1, 2019.3.0b5
Not reproducible with: 2019.3.0b6, 2019.3.4f1

Tested and reproduced on these devices:
VLNQA00125, Google Pixel 2 (Pixel 2), Android 8.1.0, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00319, Google Pixel 4 (Pixel 4), Android 10, CPU: Snapdragon 855 SM8150, GPU: Adreno (TM) 640
VLNQA00264, Samsung Galaxy S10+ (SM-G975F), Android 10, CPU: Exynos 9 9820, GPU: Mali-G76
VLNQA00322, Huawei P30 Pro (VOG-L29), Android 9, CPU: HiSilicon Kirin 980, GPU: Mali-G76
VLNQA00176, Xiaomi Redmi 4 (Redmi 4), Android 6.0.1, CPU: Snapdragon 430 MSM8937, GPU: Adreno (TM) 505
VLNQA00078, Motorola Nexus 6 (Nexus 6), Android 7.1.1, CPU: Snapdragon 805 APQ8084AB, GPU: Adreno (TM) 420

Notes:
- Doesn't reproduce from 2019.3.0b6