Bug 1841050. Mark expected test fail. r=gfx-reviewers,nical,ahale

Depends on D191597

Differential Revision: https://phabricator.services.mozilla.com/D191598

dom/canvas/test/webgl-conf/generated-mochitest.ini

@@ -8531,6 +8531,7 @@ skip-if = (os == 'mac' && debug)
 [generated/test_2_conformance__misc__uninitialized-test.html]
 subsuite = webgl2-core
 skip-if = (os == 'win' && debug) || (os == 'android' && debug)
+fail-if = (os == 'win' && !debug)
 [generated/test_2_conformance__misc__webgl-specific-stencil-settings.html]
 subsuite = webgl2-core
 skip-if = (os == 'win')

dom/canvas/test/webgl-conf/mochitest-errata.ini

@@ -104,6 +104,7 @@ skip-if = (os == 'win')
 # https://bugzilla.mozilla.org/show_bug.cgi?id=1725286
 # E.g. gl.checkFramebufferStatus(gl.FRAMEBUFFER) should be 36053. Was 0
 skip-if = (os == 'win' && debug) || (os == 'android' && debug)
+fail-if = (os == 'win' && !debug)
 [generated/test_2_conformance2__rendering__framebuffer-mismatched-attachment-targets.html]
 # https://bugzilla.mozilla.org/show_bug.cgi?id=1725283
 # E.g. framebuffer layer 0 should be drawn green