允许您为指定平台和着色器硬件层设置 PlatformShaderSettings。
If the platform you are tweaking is an active build target, the shaders will reload so you can see the results immediately. If `PlatformShaderSettings` is set to tiers that are not the same, then tier variants will be generated for the shader even if `#pragma hardware_tier_variants` is missing. You can only set Graphics Tiers in the Built-in Render Pipeline.