Steps to reproduce:
1. Open users attached project "ParticleSystemMaterialAniBug.zip"
2. Navigate to Project -> Assets -> Scenes and open SampleScene
3. Open Animation Window from Windows -> Animation
4. In the Animation Window press Record
5. In the Hierarchy Window find "BugReportOBJ" and select its child "Particle System"
6. In the Inspector Window scroll down and try changing any properties to Material
7. Notice that no Key Frames were created in the Animation window

Expected results: Key Frames are added to Animation track when any changes are made to Materials parameters
Actual results: Key Frames are not added to Animation track when Changing Particle Systems Material parameters

Reproducible with: 2017.4.25f1, 2018.3.13.f1, 2019.1.0f1, 2019.2.0a11

Fixed in: 2018.4.0f1, 2019.1.1f1, 2019.2.0a14, 2019.3.0a1