WebGLRenderer: Add data-engine="three-${REVISION}" to <canvas>. (#22792)

src/renderers/WebGLRenderer.js

@@ -1,4 +1,5 @@
 import {
+	REVISION,
 	BackSide,
 	DoubleSide,
 	FrontSide,
@@ -215,6 +216,8 @@ function WebGLRenderer( parameters = {} ) {
 			failIfMajorPerformanceCaveat: _failIfMajorPerformanceCaveat
 		};
 
+		_canvas.setAttribute( 'data-engine', `three-${REVISION}` );
+
 		// event listeners must be registered before WebGL context is created, see #12753
 
 		_canvas.addEventListener( 'webglcontextlost', onContextLost, false );