Add check for missing visual rect updates and fix failures

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).
 
 Bug(none) accessibility/ [ Skip ]
 Bug(none) animations/ [ Skip ]
 Bug(none) app_banner/ [ Skip ]
 Bug(none) battery-status/ [ Skip ]
 Bug(none) bindings/ [ Skip ]
 Bug(none) bluetooth/ [ Skip ]
@@ skipping 299 matching lines @@
 Bug(none) compositing/overflow/accelerated-scrolling-with-clip-path-text.html [ Failure ]
 Bug(none) compositing/overflow/accelerated-scrolling-with-clip-path.html [ Failure ]
 Bug(none) compositing/overflow/ancestor-with-clip-path.html [ Failure ]
 Bug(none) compositing/overflow/avoid-ancestor-clip-for-scroll-children.html [ Failure ]
 Bug(none) compositing/overflow/body-switch-composited-scrolling.html [ Failure ]
 Bug(none) compositing/overflow/clear-scroll-parent.html [ Failure ]
 Bug(none) compositing/overflow/clip-descendents.html [ Failure ]
 # puts the 'scroller' layer after 'overlap' and 'target'
 Bug(none) compositing/overflow/composited-scroll-overlap-test.html [ Failure ]
 Bug(none) compositing/overflow/composited-scrolling-paint-phases.html [ Failure ]
-Bug(none) compositing/overflow/content-gains-scrollbars.html [ Failure ]
 Bug(none) compositing/overflow/content-loses-scrollbars.html [ Failure ]
 Bug(none) compositing/overflow/descendant-with-clip-path.html [ Failure ]
 Bug(none) compositing/overflow/mask-with-filter.html [ Failure ]
 Bug(none) compositing/overflow/mask-with-small-content-rect.html [ Failure ]
 Bug(none) compositing/overflow/nested-border-radius-clipping.html [ Failure ]
 Bug(none) compositing/overflow/nested-render-surfaces-with-intervening-clip.html [ Failure ]
 Bug(none) compositing/overflow/nested-render-surfaces-with-rotation.html [ Failure ]
 Bug(none) compositing/overflow/nested-render-surfaces.html [ Failure ]
 Bug(none) compositing/overflow/nested-scrolling.html [ Failure ]
 Bug(none) compositing/overflow/opt-in-if-composited.html [ Failure ]
@@ skipping 1060 matching lines @@
 Bug(none) transforms/transform-table-row.html [ Failure ]
 Bug(none) transforms/transformed-caret.html [ Pass Failure ]
 Bug(none) transforms/transformed-focused-text-input.html [ Failure ]
 Bug(none) transforms/transforms-with-opacity.html [ Failure ]
 
 crbug.com/644358 compositing/gestures/gesture-tapHighlight-2-iframe-scrolled-outer-late-composite.html [ Failure ]
 crbug.com/644358 compositing/iframes/connect-compositing-iframe-delayed.html [ Failure ]
 crbug.com/644358 compositing/iframes/connect-compositing-iframe.html [ Failure ]
 crbug.com/644358 compositing/iframes/enter-compositing-iframe.html [ Failure ]
 crbug.com/644358 compositing/squashing/squashed-layer-loses-graphicslayer.html [ Failure ]
-
+crbug.com/644358 compositing/overflow/content-gains-scrollbars.html [ Crash ]
 crbug.com/644358 fast/canvas/canvas-composite-video-shadow.html [ Failure ]
 
 Bug(none) compositing/layer-creation/main-thread-scrolling-for-non-composited-fixed-position-if-overflow-hidden.html [ Failure ]
 Bug(none) compositing/layer-creation/main-thread-scrolling-for-non-composited-fixed-position.html [ Failure ]
 Bug(none) compositing/overflow/overflow-auto-with-touch-toggle.html [ Failure ]
 Bug(none) compositing/overflow/overflow-auto-with-touch.html [ Failure ]
 Bug(none) compositing/overflow/overflow-hidden-with-touch.html [ Failure ]
 Bug(none) compositing/overflow/overflow-overlay-with-touch.html [ Failure ]
 Bug(none) compositing/squashing/invalidations-with-large-negative-margin-inline-content.html [ Failure ]
 Bug(none) fast/dom/vertical-scrollbar-in-rtl.html [ Failure ]
@@ skipping 232 matching lines @@
 Bug(none) virtual/threaded/inspector/ [ Skip ]
 Bug(none) virtual/threaded/fast/scroll-behavior/ [ Skip ]
 Bug(none) virtual/threaded/compositing/visibility/layer-visible-content.html [ Failure ]
 Bug(none) virtual/threaded/compositing/visibility/overlays-persist-on-navigation.html [ Crash ]
 Bug(none) virtual/threaded/compositing/visibility/overlays.html [ Crash ]
 Bug(none) virtual/threaded/compositing/visibility/visibility-image-layers-dynamic.html [ Crash Failure ]
 Bug(none) virtual/threaded/compositing/visibility/visibility-image-layers.html [ Failure ]
 Bug(none) virtual/threaded/compositing/visibility/visibility-simple-video-layer.html [ Failure ]
 Bug(none) virtual/threaded/compositing/webgl/webgl-reflection.html [ Failure ]
 Bug(none) virtual/threaded/printing/ [ Skip ]