Creating a webgpu surface from the canvas with the new webgpu bindings (Dawn)

[Myrindd]

I am currently looking at moving from the deprecated bindings to Dawn, but I need to get the render surface from a pre-existing canvas with a given ID. In the old bindings, all I needed to do was use SurfaceDescriptorFromCanvasHTMLSelector. Seems like it is no longer possible with the new bindings.

[Schlabbermampf]

the naming is a little different:

	WGPUEmscriptenSurfaceSourceCanvasHTMLSelector fromCanvasHTMLSelector = {};
	fromCanvasHTMLSelector.chain.sType = WGPUSType_EmscriptenSurfaceSourceCanvasHTMLSelector;
	fromCanvasHTMLSelector.chain.next = NULL;
	fromCanvasHTMLSelector.selector = { "canvas", WGPU_STRLEN };

	WGPUSurfaceDescriptor surfaceDescriptor = {};
	surfaceDescriptor.nextInChain = &fromCanvasHTMLSelector.chain;
	surfaceDescriptor.label = { "Screen Surface", WGPU_STRLEN };

	m_Surface = wgpuInstanceCreateSurface( m_Instance, &surfaceDescriptor );