Steps to reproduce:
1. Open attached project
2. Build "SampleScene" to Android
3. Open 2 apps split screen (the first app is the one you built, second can be random)
4. Drag marker in the middle up and down to resize the application
5. Rotate to landscape and back to portrait
-Contents in the app should be stretched (for more info see image and video attached)

Expected result: After rotation application contents shouldn't stretch. It should maintain the correct aspect ratio

Reproduced on: 2018.3.7f1 (2e3e9ca8db15), 2018.3.8f1 (57216e80a4e3), 2018.3.9f1 (947e1ea5aa8d), 2018.3.10f1 (f88de2c96e63), 2018.3.12f1, 2019.1.0a8, 2019.1.0a11, 2019.1.0b10, 2019.2.0a1, 2019.2.0a10
Doesn't reproduce on: 2017.4.0f1, 2017.4.25f1, 2018.3.0a1, 2018.3.6f1 (a220877bc173)
Regressed in: 2018.3.7f1 (2e3e9ca8db15), 2019.1.0a8

Devices under test:
N/A, Xiaomi (POCOPHONE F1), 9, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630
VLNQA00001, Google Pixel 2 (Pixel 2), 9, CPU: Snapdragon 835 MSM8998, GPU: Adreno (TM) 540
VLNQA00136, Samsung Galaxy S9+ (SM-G965F), 8.0.0, CPU: Exynos 9 Series 9810, GPU: Mali-G72
VLNQA00178, Xiaomi Redmi Note 4 (Redmi Note 4), 6.0, CPU: MediaTek Helio X20 MT6797M, GPU: Mali-T880

Reproduced on both Vulkan and OpenGLES3