Bug 1518999 - Enable fcp only PerformancePaintTming tests r=mstange

Depends on D68646

Differential Revision: https://phabricator.services.mozilla.com/D68647

testing/web-platform/meta/paint-timing/fcp-only/fcp-background-size.html.ini

-[fcp-background-size.html]
-  [First contentful paint fires due to background size.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-bg-image-set.html.ini

 [fcp-bg-image-set.html]
+  expected: TIMEOUT
   [First contentful paint fires due to background image in image-set.]
-    expected: FAIL
+    expected: TIMEOUT # We don't have image-set supported yet
 

testing/web-platform/meta/paint-timing/fcp-only/fcp-bg-image-two-steps.html.ini

-[fcp-bg-image-two-steps.html]
-  [First contentful paint fires for background image only when visible.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-canvas-context.html.ini

-[fcp-canvas-context.html]
-  [Canvas should count as contentful when context is created]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-gradient.html.ini

-[fcp-gradient.html]
-  [Gradients should not count as contentful]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-invisible-3d-rotate-descendant.html.ini

-[fcp-invisible-3d-rotate-descendant.html]
-  [First contentful paint fires due to its ancestor getting rotating into view.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-invisible-3d-rotate.html.ini

-[fcp-invisible-3d-rotate.html]
-  [First contentful paint fires due to 3d rotation into view.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-invisible-scale-transition.html.ini

-[fcp-invisible-scale-transition.html]
-  [First contentful paint fires when revealed during transition.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-invisible-scale.html.ini

-[fcp-invisible-scale.html]
-  [First contentful paint fires due to scale becoming positive.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-invisible-text.html.ini

-[fcp-invisible-text.html]
-  [First contentful paint fires due to pseudo-element becoming visible.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-opacity-descendant.html.ini

-[fcp-opacity-descendant.html]
-  [First contentful paint fires due to its ancestor getting positive opacity.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-opacity.html.ini

-[fcp-opacity.html]
-  [First contentful paint fires due to opacity-revealed element.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-out-of-bounds-translate.html.ini

-[fcp-out-of-bounds-translate.html]
-  [First contentful paint fires due to transform-based intersection with document.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-out-of-bounds.html.ini

-[fcp-out-of-bounds.html]
-  [First contentful paint fires due to intersection with document.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-pseudo-element-display.html.ini

-[fcp-pseudo-element-display.html]
-  [First contentful paint fires due to pseudo-element text.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-pseudo-element-image.html.ini

-[fcp-pseudo-element-image.html]
-  [First contentful paint fires due to pseudo-element image.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-pseudo-element-opacity.html.ini

-[fcp-pseudo-element-opacity.html]
-  [First contentful paint fires due to pseudo-element getting positive opacity.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-pseudo-element-text.html.ini

-[fcp-pseudo-element-text.html]
-  [First contentful paint fires due to pseudo-element text.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-pseudo-element-visibility.html.ini

-[fcp-pseudo-element-visibility.html]
-  [First contentful paint fires due to pseudo-element becoming visible.]
-    expected: FAIL
-

testing/web-platform/meta/paint-timing/fcp-only/fcp-svg.html.ini

-[fcp-svg.html]
-  [First contentful paint fires when SVG becomes contentful.]
-    expected: FAIL
-