WebGLRenderer: Handle parameters.depth.

src/renderers/WebGLRenderer.js

@@ -19,6 +19,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 	_buffers = {},
 
 	_alpha = parameters.alpha !== undefined ? parameters.alpha : false,
+	_depth = parameters.depth !== undefined ? parameters.depth : true,
 	_premultipliedAlpha = parameters.premultipliedAlpha !== undefined ? parameters.premultipliedAlpha : true,
 	_antialias = parameters.antialias !== undefined ? parameters.antialias : false,
 	_stencil = parameters.stencil !== undefined ? parameters.stencil : true,
@@ -6406,6 +6407,7 @@ THREE.WebGLRenderer = function ( parameters ) {
 
 			var attributes = {
 				alpha: _alpha,
+				depth: _depth,
 				premultipliedAlpha: _premultipliedAlpha,
 				antialias: _antialias,
 				stencil: _stencil,