Nanite and mobile landscape don't have support for dynamic materials

On a landscape actor with Nanite landscape enabled, set the bUseDynamicMaterialInstance property on a landscape proxy and setup a BP to call  SetLandscapeMaterialTextureParameterValue / SetLandscapeMaterialVectorParameterValue, /SetLandscapeMaterialScalarParameterValue. 

Judging by what is in the code in ALandscapeProxy::MakeAsyncNaniteBuildData, the dynamic MID will not be supported on Nanite landscape (we'd need to setup material overrides on the ULandscapeNaniteComponent for this to work). 

The mobile path also doesn't seem to be supported : see FLandscapeComponentSceneProxy::FLandscapeComponentSceneProxy (//TODO: Add support for bUseDynamicMaterialInstance ?) : we probably need a MobileMaterialInterfacesDynamic

• Download attached project from UDN.
• Open "BasicTest" level.
• Enter PIE.
• Notice the cogwheel changes colors while the landscape doesn't.
• Disable nanite for landscape (landscape.RenderNanite 0).
• The landscape now changes color.