Skia WEBGL multiple surfaces bug

[Birat Thapa]

I have come across a problem using 2 WEBGL surfaces. When I try to drawImage from one WEBGL(GPU) and one SW(CPU), it draws as expected in both canvas.

However, when I try to drawImage from one WEBGL surface to another WEBGL surface it does not draw. 

I have replicated the code below.

2 WEBGL: 

 https://jsfiddle.skia.org/canvaskit/8650900c838eba117779a7c1fc5adcd34d425974fed96c72940de2d288126131

1 WEBGL 1 SW: 

https://jsfiddle.skia.org/canvaskit/1d77af927477b4f169570df14c790513bb03636944e952a1fb36391859d76051

The code above are identical except for the MakeSWCanvasSurface() creation. If you cannot see the second canvas, please scroll.

Why does drawImage from one WEBGL to another WEBGL not work but WEBGL to SW work?