Bug Miss PhysicsDynamicDebugMaterial.mat and PhysicsStaticDebugMaterial.mat

hi:
in 1.0.0-exp.8 version, DrawMeshUtility class use this two materials, but they are missing, so enable PhysicsDebugDisplay, we can get DrawMeshInstanced does not support the shader 'Hidden/InternalErrorShader' because it does not read any instanced properties. Try switching to DrawMeshInstancedProcedural if the shader is doing procedural instancing error.

 

because the debug mat is PhysicsStaticDebugMaterial.mat, and it use shader is PhysicsStatic.shader。but PhysicsStatic.shader is in PhysicsSamples project。