SPv2: Add support for tracking raster paint invalidations in testing.

third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2

 # Expectations for slimming paint v2
 # See: https://docs.google.com/document/d/1QCM912Dr6u38DqyQqd7pxQxDy8FFOoWMMDq7uAXqKdA/view
 # We are focused on fast/, compositing/, and svg/ with all other directories skipped (for now).
 
 accessibility/ [ Skip ]
 animations/ [ Skip ]
 app_banner/ [ Skip ]
 battery-status/ [ Skip ]
 bindings/ [ Skip ]
 bluetooth/ [ Skip ]
@@ skipping 269 matching lines @@
 compositing/layout-width-change.html [ Failure ]
 compositing/masks/direct-image-mask.html [ Failure ]
 compositing/masks/mask-layer-size.html [ Failure ]
 compositing/masks/mask-of-clipped-layer.html [ Failure ]
 compositing/masks/masked-ancestor.html [ Failure ]
 compositing/masks/multiple-masks.html [ Failure ]
 compositing/masks/simple-composited-mask.html [ Failure ]
 compositing/overflow/accelerated-overflow-scroll-should-not-affect-perspective.html [ Failure ]
 compositing/overflow/accelerated-scrolling-with-clip-path-text.html [ Failure ]
 compositing/overflow/accelerated-scrolling-with-clip-path.html [ Failure ]
-compositing/overflow/ancestor-with-clip-path.html [ Failure ]
 compositing/overflow/avoid-ancestor-clip-for-scroll-children.html [ Failure ]
 compositing/overflow/body-switch-composited-scrolling.html [ Failure ]
 compositing/overflow/clear-scroll-parent.html [ Failure ]
 compositing/overflow/clip-descendents.html [ Failure ]
 compositing/overflow/clip-parent-reset.html [ Failure ]
 compositing/overflow/composited-scrolling-paint-phases.html [ Failure ]
 compositing/overflow/content-gains-scrollbars.html [ Failure ]
 compositing/overflow/content-loses-scrollbars.html [ Failure ]
-compositing/overflow/descendant-with-clip-path.html [ Failure ]
 compositing/overflow/do-not-paint-outline-into-composited-scrolling-contents.html [ Failure ]
 compositing/overflow/nested-border-radius-clipping.html [ Failure ]
 compositing/overflow/nested-render-surfaces-with-intervening-clip.html [ Failure ]
 compositing/overflow/nested-render-surfaces-with-rotation.html [ Failure ]
 compositing/overflow/nested-render-surfaces.html [ Failure ]
 compositing/overflow/nested-scrolling.html [ Failure ]
-compositing/overflow/opt-in-if-composited.html [ Failure ]
 compositing/overflow/overflow-compositing-descendant.html [ Failure ]
 compositing/overflow/overflow-scaled-descendant-overlapping.html [ Crash Timeout ]
 compositing/overflow/overflow-scroll-background-opaque-to-transparent.html [ Failure ]
 compositing/overflow/overflow-scroll-background-transparent-to-opaque.html [ Failure ]
 compositing/overflow/overflow-scroll-with-opaque-background-will-change.html [ Failure ]
 compositing/overflow/overflow-scroll-with-opaque-background.html [ Failure ]
 compositing/overflow/overflow-scroll-with-pointer-events-toggle.html [ Failure ]
 compositing/overflow/overflow-scroll-with-transparent-background.html [ Failure ]
 compositing/overflow/overflow-scrollbar-layers.html [ Failure ]
 compositing/overflow/reparented-scrollbars-non-sc-anc.html [ Failure ]
 compositing/overflow/resize-painting.html [ Failure ]
 compositing/overflow/scroll-ancestor-update.html [ Failure ]
 compositing/overflow/scroll-parent-absolute-with-backdrop-filter.html [ Failure ]
 compositing/overflow/scroll-parent-absolute.html [ Failure ]
 compositing/overflow/scroll-parent-with-non-stacking-context-composited-ancestor.html [ Failure ]
 compositing/overflow/scrollbar-layer-placement.html [ Failure ]
-compositing/overflow/scroller-with-border-radius.html [ Failure ]
 compositing/overflow/scrolling-content-clip-to-viewport.html [ Failure ]
 compositing/overflow/selection-gaps-after-removing-scrolling-contents.html [ Failure ]
 compositing/overflow/selection-gaps-toggling-with-scrolling-contents.html [ Failure ]
 compositing/overflow/selection-gaps-toggling.html [ Failure ]
 compositing/overflow/textarea-scroll-touch.html [ Failure ]
 compositing/overflow/universal-accelerated-overflow-scroll.html [ Failure ]
 compositing/overflow/update-widget-positions-on-nested-frames-and-scrollers.html [ Crash ]
 compositing/overlap-blending/children-opacity-huge.html [ Failure ]
 compositing/overlap-blending/children-opacity-no-overlap.html [ Failure ]
 compositing/overlap-blending/reflection-opacity-huge.html [ Failure ]
@@ skipping 1819 matching lines @@
 crbug.com/637316 svg/text/text-gradient-positioning.svg [ Failure ]
 crbug.com/637316 svg/text/text-outline-rgba.html [ Failure ]
 crbug.com/637316 svg/text/text-path-middle-align.svg [ Failure ]
 
 fast/scrolling/overflow-scrollability.html [ Failure ]
 fast/scrolling/scrollbar-prevent-default.html [ Failure ]
 compositing/lots-of-img-layers-with-opacity.html [ Failure ]
 compositing/lots-of-img-layers.html [ Failure ]
 
 fast/events/overflow-composited-scroll-fake-mouse-move.html [ Skip ]
+
+# These timeout due to a JS errr parsing layerTreeAsText
+crbug.com/647831 compositing/overflow/ancestor-with-clip-path.html [ Timeout ]
+crbug.com/647831 compositing/overflow/opt-in-if-composited.html [ Timeout ]
+crbug.com/647831 compositing/overflow/descendant-with-clip-path.html [ Timeout ]
+crbug.com/647831 compositing/overflow/scroller-with-border-radius.html [ Timeout ]