Paint some content for animated elements in composited animation tests.

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 1599 matching lines @@
 
 # Subpixel adjustments due to differences in compositing
 Bug(none) svg/custom/non-scaling-stroke-update.svg [ Failure ]
 Bug(none) svg/custom/use-css-events.svg [ Failure ]
 Bug(none) svg/text/text-layout-crash.html [ Failure ]
 Bug(none) images/color-profile-iframe.html [ Failure ]
 Bug(none) compositing/overflow/do-not-paint-outline-into-composited-scrolling-contents.html [ Failure ]
 Bug(none) fast/table/edge-offsets.html [ Failure ]
 
 # Some work remains to fully support composited animation and scrolling.
-crbug.com/674317 virtual/threaded/animations/KeyframeEffectReadOnly-composited-animation.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/composited-animations-rotate-zero-degrees.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/composited-animations-simple.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/composited-animations-timing-function.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/composited-animations-translate-rotate-scale.html [ Timeout ]
 crbug.com/674317 virtual/threaded/animations/composited-filter-webkit-filter.html [ Failure ]
 crbug.com/674317 virtual/threaded/animations/compositor-independent-transform-cancel.html [ Failure ]
-crbug.com/674317 virtual/threaded/animations/compositor-start-event-timing.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/element-animate-positive-delay.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/img-element-transform.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/inline-block-transform.html [ Timeout ]
-crbug.com/674317 virtual/threaded/animations/sample-on-last-keyframe.html [ Timeout ]
+crbug.com/692310 virtual/threaded/animations/sample-on-last-keyframe.html [ Timeout ]
 crbug.com/674317 virtual/threaded/animations/skew-notsequential-compositor.html [ Failure ]
-crbug.com/674317 virtual/threaded/animations/transitions-retarget.html [ Timeout ]
 crbug.com/674317 virtual/threaded/animations/zoom-responsive-transform-animation.html [ Timeout ]
 crbug.com/674317 virtual/threaded/fast/scroll-behavior/first-scroll-runs-on-compositor.html [ Timeout ]
 crbug.com/674317 virtual/threaded/fast/scroll-behavior/smooth-scroll/fixed-background-in-iframe.html [ Crash Failure ]
 crbug.com/674317 virtual/threaded/fast/scroll-behavior/smooth-scroll/main-thread-scrolling-reason-added.html [ Timeout ]
 crbug.com/674317 virtual/threaded/fast/scroll-behavior/smooth-scroll/main-thread-scrolling-reason-correctness.html [ Timeout ]
 crbug.com/674317 virtual/threaded/fast/scroll-behavior/smooth-scroll/mousewheel-scroll-interrupted.html [ Timeout ]
 crbug.com/674317 virtual/threaded/transitions/extra-transition.html [ Timeout ]
 crbug.com/674317 virtual/threaded/transitions/opacity-transform-transitions-inside-iframe.html [ Timeout ]
 crbug.com/674317 virtual/threaded/transitions/opacity-transition-zindex.html [ Timeout ]
 crbug.com/674317 virtual/threaded/transitions/transition-end-event-destroy-iframe.html [ Timeout ]
@@ skipping 10 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 ]