Implement PaintLayer::scrollsWithViewport for SPv2.

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

Index: third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2
diff --git a/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2 b/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2
index 16d5995a28c0979b69613c0438a42a1fe7ad9341..f93adfb02a448220aad9220fefab38e97d935cd8 100644
--- a/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2
+++ b/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2
@@ -246,6 +246,7 @@ Bug(none) compositing/layer-creation/fixed-position-out-of-view-with-backdrop-fi
 Bug(none) compositing/layer-creation/fixed-position-out-of-view.html [ Failure ]
 Bug(none) compositing/layer-creation/fixed-position-scroll.html [ Failure ]
 Bug(none) compositing/layer-creation/fixed-position-under-transform.html [ Failure ]
+crbug.com/671838 compositing/layer-creation/iframe-background-attachment-fixed.html [ Failure ]
 Bug(none) compositing/layer-creation/no-compositing-for-fixed-position-under-transform.html [ Failure ]
 Bug(none) compositing/layer-creation/no-compositing-for-preserve-3d.html [ Failure ]
 Bug(none) compositing/layer-creation/overflow-scroll-overlap.html [ Failure ]
@@ -316,6 +317,9 @@ Bug(none) compositing/overflow/scroll-parent-with-non-stacking-context-composite
 Bug(none) compositing/overflow/scrollbar-layer-placement.html [ Failure ]
 Bug(none) compositing/overflow/scroller-with-border-radius.html [ Failure ]
 Bug(none) compositing/overflow/scrolling-content-clip-to-viewport.html [ Failure ]
+crbug.com/667946 compositing/overflow/scrolls-with-respect-to-nested.html [ Failure ]
+crbug.com/667946 compositing/overflow/scrolls-with-respect-to-transform.html [ Failure ]
+crbug.com/667946 compositing/overflow/scrolls-with-respect-to.html [ Failure ]
 Bug(none) compositing/overflow/textarea-scroll-touch.html [ Failure ]
 Bug(none) compositing/overflow/universal-accelerated-overflow-scroll.html [ Failure ]
 Bug(none) compositing/overlap-blending/children-opacity-huge.html [ Failure ]
@@ -600,6 +604,7 @@ Bug(none) fast/dynamic/first-letter-after-list-marker.html [ Failure ]
 Bug(none) fast/encoding/utf-16-big-endian.html [ Failure ]
 Bug(none) fast/encoding/utf-16-little-endian.html [ Failure ]
 Bug(none) fast/events/autoscroll.html [ Failure ]
+crbug.com/667946 fast/events/autoscroll-disabled-in-fix.html [ Skip ]
 Bug(none) fast/events/context-no-deselect.html [ Failure ]
 Bug(none) fast/events/gesture-pinch-zoom-scroll-bubble.html [ Failure ]
 Bug(none) fast/events/keyboard-scroll-by-page.html [ Failure ]