Layer component: wait referenceSpace to be set before calling initLayer

[vincentfretin]

Description:

I got an error space argument required when calling xrGLFactory.createQuadLayer here

aframe/src/components/layer.js

Lines 247 to 253 in 6de8119

	this.layer = xrGLFactory.createQuadLayer({
	space: this.referenceSpace,
	viewPixelHeight: 2048,
	viewPixelWidth: 2048,
	height: this.data.height / 2 || this.texture.image.height / 1000,
	width: this.data.width / 2 || this.texture.image.width / 1000
	});

In onEnterVR, this.referenceSpace is set asynchronously via

aframe/src/components/layer.js

Line 369 in 6de8119

xrSession.requestReferenceSpace('local-floor').then(this.onRequestedReferenceSpace);

that does

aframe/src/components/layer.js

Line 385 in 6de8119

this.referenceSpace = referenceSpace;

so in my case createQuadLayer was called before this.referenceSpace was set.

Changes proposed:

• Wait this.referenceSpace to be set before calling this.initLayer

[dmarcos]

Thanks!