Steps to reproduce:

1) Download attached project 'msaa_2017_bug.zip' and open in Unity
2) Make sure VR SDK is set to Daydream in the Player Settings
3) Build and Run 'scene' scene on a device
4) Observe the screen
Black/distorted frame will appear every 3rd second ( check attached video 'msaa3.mp4')

Expected result: No black/distorted frame when switching between MSAA levels
Actual result: Black/distorted frame appears every 3rd second when switching between MSAA levels

Reproduced with:
5.6.3p2, 2017.1.0p5, 2017.2.0b9, 2017.3.0a6

Device under testing:
Google Pixel*, OS:7.1.2, CPU:arm64-v8a, GPU:Adreno (TM) 530, Build:google/sailfish/sailfish:7.1.2/NJH47D/4045516:user/release-keys

Note: I wasn't able to reproduce using Cardboard VR SDK with Samsung SM G930F*, OS:7.0, CPU:arm64-v8a, GPU:Mali-T880, Build:samsung/heroltexx/herolte:7.0/NRD90M/G930FXXU1ZPK3:user/release-keys