[SPv2] Defer decision of raster invalidation after paint for changes z-index, transform, etc.

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 582 matching lines @@
 fast/clip/nestedTransparencyClip.html [ Failure ]
 fast/clip/outline-overflowClip.html [ Failure ]
 fast/clip/overflow-border-radius-clip.html [ Failure ]
 fast/clip/overflow-border-radius-combinations.html [ Failure ]
 fast/clip/overflow-border-radius-composited-parent.html [ Failure ]
 fast/clip/overflow-border-radius-composited.html [ Failure ]
 fast/clip/overflow-border-radius-fixed-position.html [ Failure ]
 fast/clip/overflow-border-radius-transformed.html [ Failure ]
 fast/css-generated-content/014.html [ Failure ]
 fast/css-generated-content/table-parts-before-and-after.html [ Failure ]
+fast/css-grid-layout/grid-item-z-index-change-repaint.html [ Failure ]

[chrishtr, 2016/09/07 20:49:02]

These are marked as Failure because they invalidate
differently, right? Should these be part of the virtual test
suite with different expectations perhaps?

[Xianzhu, 2016/09/07 21:38:35]

Yes.
There are also many other repaint tests having the similar issue. I think it's a
good way to run them as virtual tests with new baselines.

[pdr., 2016/09/08 01:36:23]

There are about 426 repaint tests in fast/ (43 outside fast/repaint) and another
534 repaint tests in svg/ (490 outside svg/repaint) so we're talking about a lot
of tests to maintain.

I don't have a great plan for this. What if we moved all repaint tests to a
repaint/ directory and just ran those directories as virtual tests suites? Do
you have a feeling for how many failures we would need to initially add to
TestExpectations for that to work?

[Xianzhu, 2016/09/08 03:01:42]

I planned to move all repaint tests to paint/invalidation directory, but haven't
found a time to do it yet. It might be a proper time to do this after this CL.
When moving them, I would generate new baselines instead of adding them to
TestExpectations. We can verify the validity of the new baselines after we get
raster-invalidation raster-under-invalidation-checking work.

 fast/css-grid-layout/min-width-height-auto-overflow.html [ Failure ]
 fast/css-grid-layout/scrolled-grid-painting-overflow.html [ Failure ]
 fast/css-grid-layout/scrolled-grid-painting.html [ Failure ]
 fast/css/acid2.html [ Failure ]
 fast/css/bidi-override-in-anonymous-block.html [ Failure ]
 fast/css/border-height.html [ Failure ]
 fast/css/color-correction-backgrounds-and-text.html [ Failure ]
 fast/css/color-correction-on-background-image.html [ Failure ]
 fast/css/containment/paint-containment-with-absolute-position.html [ Failure ]
 fast/css/containment/paint-containment-with-box-shadow.html [ Failure ]
@@ skipping 572 matching lines @@
 fast/repaint/clip-unclip-and-change.html [ Failure ]
 fast/repaint/composited-iframe-scroll-repaint.html [ Failure ]
 fast/repaint/containing-block-position-change.html [ Failure ]
 fast/repaint/delete-into-nested-block.html [ Failure ]
 fast/repaint/destroy-composited-scrollbar.html [ Failure ]
 fast/repaint/dont-invalidate-root-layer-when-composited-layer-becomes-visible.html [ Failure ]
 fast/repaint/filter-invalidation-with-composited-container-change.html [ Failure ]
 fast/repaint/filter-repaint-accelerated-child-with-filter-child.html [ Failure ]
 fast/repaint/filter-repaint-accelerated-on-accelerated-filter.html [ Failure ]
 fast/repaint/filter-repaint-on-accelerated-layer.html [ Failure ]
+fast/repaint/fixed-after-scroll.html [ Failure ]
 fast/repaint/fixed-and-absolute-position-scrolled.html [ Failure ]
 fast/repaint/fixed-child-move-after-scroll.html [ Failure ]
 fast/repaint/fixed-child-of-fixed-move-after-scroll.html [ Failure ]
 fast/repaint/fixed-child-of-transformed-move-after-scroll.html [ Failure ]
 fast/repaint/fixed-element-repaint-after-compositing-update.html [ Failure ]
 fast/repaint/fixed-in-page-scale.html [ Crash Timeout ]
 fast/repaint/fixed-move-after-scroll.html [ Failure ]
 fast/repaint/fixed-right-bottom-in-page-scale.html [ Crash Timeout ]
+fast/repaint/fixed-to-relative-position-with-absolute-child.html [ Failure ]
 fast/repaint/fixed-tranformed.html [ Failure ]
 fast/repaint/fixed-under-composited-absolute-scrolled.html [ Failure ]
 fast/repaint/fixed-under-composited-fixed-scrolled.html [ Failure ]
 fast/repaint/fixed.html [ Failure ]
 fast/repaint/focus-ring.html [ Failure ]
 fast/repaint/full-viewport-repaint-for-background-attachment-fixed.html [ Failure ]
 fast/repaint/hover-invalidation-table.html [ Failure ]
 fast/repaint/image-resize.html [ Failure ]
 fast/repaint/inline-focus.html [ Failure ]
 fast/repaint/inline-outline-repaint.html [ Failure ]
 fast/repaint/inline-style-change-in-scrolled-view.html [ Failure ]
 fast/repaint/invalidate-paint-in-iframe-in-composited-layer.html [ Failure ]
 fast/repaint/invalidation-after-opacity-change-subtree.html [ Failure ]
 fast/repaint/japanese-rl-selection-clear.html [ Failure ]
 fast/repaint/japanese-rl-selection-repaint.html [ Failure ]
 fast/repaint/line-flow-with-floats-1.html [ Failure ]
 fast/repaint/line-flow-with-floats-10.html [ Failure ]
 fast/repaint/line-flow-with-floats-2.html [ Failure ]
 fast/repaint/line-flow-with-floats-3.html [ Failure ]
 fast/repaint/line-flow-with-floats-4.html [ Failure ]
 fast/repaint/line-flow-with-floats-5.html [ Failure ]
 fast/repaint/line-flow-with-floats-6.html [ Failure ]
 fast/repaint/line-flow-with-floats-7.html [ Failure ]
 fast/repaint/line-flow-with-floats-8.html [ Failure ]
 fast/repaint/line-flow-with-floats-9.html [ Failure ]
+fast/repaint/mix-blend-mode-separate-stacking-context.html [ Failure ]
 fast/repaint/multicol-as-paint-container.html [ Failure ]
 fast/repaint/multicol-nested.html [ Failure ]
 fast/repaint/multicol-repaint.html [ Failure ]
 fast/repaint/multicol-with-abspos-in-relpos.html [ Failure ]
 fast/repaint/multicol-with-block.html [ Failure ]
 fast/repaint/multicol-with-inline.html [ Failure ]
 fast/repaint/multicol-with-overflowing-block-rl.html [ Failure ]
 fast/repaint/multicol-with-relpos.html [ Failure ]
 fast/repaint/multicol-with-text.html [ Failure ]
 fast/repaint/multiple-backgrounds-style-change.html [ Failure ]
@@ skipping 1043 matching lines @@
 crbug.com/642240 fast/canvas/canvas-hidpi-blurry.html [ Failure ]
 crbug.com/642240 fast/hidpi/broken-image-icon-hidpi.html [ Failure ]
 crbug.com/642240 fast/hidpi/broken-image-with-size-hidpi.html [ Failure ]
 crbug.com/642240 fast/hidpi/clip-text-in-hidpi.html [ Failure ]
 crbug.com/642240 fast/hidpi/device-scale-factor-paint.html [ Failure ]
 crbug.com/642240 fast/hidpi/focus-rings.html [ Failure ]
 crbug.com/642240 fast/hidpi/gradient-with-scaled-ancestor.html [ Failure ]
 crbug.com/642240 fast/hidpi/resize-corner-hidpi.html [ Failure ]
 crbug.com/642240 fast/sub-pixel/shadows-hidpi.html [ Failure ]
 crbug.com/642240 svg/as-image/image-respects-deviceScaleFactor.html [ Failure ]