[GTK] 3 new failures on layout tests webgl/1.0.3/conformance/glsl/misc/ after r271524

• Component: WebKitGTK
• Status: NEW ---

[Carlos Alberto Lopez Perez]

This 3 layout tests started failing on GTK after r271524

Regressions: Unexpected text-only failures (7)
  webgl/1.0.3/conformance/glsl/misc/shaders-with-missing-varyings.html [ Failure ]
  webgl/1.0.3/conformance/glsl/misc/shaders-with-varyings.html [ Failure ]
  webgl/1.0.3/conformance/rendering/gl-scissor-test.html [ Failure ]


Diffs: http://sprunge.us/iVaXk7


On the WPE port this failures don't happen.
And I'm unable to reproduce the failures on GTK when I build GTK against my Debian10 system libraries (instead of flatpak).
So perhaps this is related to the Mesa version

On the GTK Wayland bot the test webgl/1.0.3/conformance/rendering/gl-scissor-test.html passes, the other 2 fail as well.

[Carlos Alberto Lopez Perez]

Tests marked as failing in r275376

[Alejandro G. Castro]

After replacing the WebGL backend with ANGLE 2 of these tests are fixed:

webgl/1.0.3/conformance/glsl/misc/shaders-with-missing-varyings.html
webgl/1.0.3/conformance/glsl/misc/shaders-with-varyings.html

Now just gl-scissor-test.html fails. The gardening commit is:

https://commits.webkit.org/255008@main