WebGL not working on Intel HD Graphics 2500

Open http://webglreport.com in a QWebEngineView to check if WebGL is supported.

The page states that the browser supports WebGL, but it is disabled or unavailable as you can see in the attached screen-shots (web_engine_1.png and web_engine_2.png).

However, if the same page is opened from chrome on the same machine, it states that both WebGL 1 and 2 are supported (chrome_1.png, chrome_2.png).

We have tried passing the Chromium flags --ignore-gpu-blacklist and enable-gpu-rasterization but they did not fix the problem. We have also tried with --disable_chromium_framebuffer_multisample and this one enabled WebGL but it also made lines appear jagged, possibly because it makes anti-aliasing useless.

We have also attached the output of chrome://gpu/ opened from a QWebEngineView.