Mark two more layout tests failing with RLS.

These weren't caught in http://crrev.com/532638, but they are failing on
win7_chromium_rel_ng:

https://ci.chromium.org/buildbot/tryserver.chromium.win/win7_chromium_rel_ng/91452

Bug: 711468
Change-Id: Iae4b8a5e5a56e96bc835556fe6cc5fcdf11dedac
Reviewed-on: https://chromium-review.googlesource.com/893214Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Steve Kobes <skobes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532982}

third_party/WebKit/LayoutTests/FlagExpectations/root-layer-scrolls

 crbug.com/417782 compositing/iframes/become-composited-nested-iframes.html [ Failure ]
+crbug.com/417782 [ Win ] compositing/masks/mask-layer-size.html [ Failure ]
 crbug.com/417782 compositing/overflow/border-radius-composited-subframe.html [ Failure ]
 crbug.com/417782 compositing/overflow/tiled-mask.html [ Failure ]
 crbug.com/417782 compositing/squashing/squash-above-fixed-1.html [ Failure ]
@@ -26,6 +27,7 @@ crbug.com/417782 inspector-protocol/page/get-layout-metrics.js [ Failure ]
 crbug.com/417782 paint/invalidation/background/body-background-image.html [ Failure ]
 crbug.com/417782 paint/invalidation/background/viewport-gradient-background-html-move-overflow.html [ Failure ]
 crbug.com/417782 paint/invalidation/background/viewport-gradient-background-html-resize-overflow.html [ Failure ]
+crbug.com/417782 [ Win ] paint/invalidation/clip/clip-path-constant-repaint.html [ Failure ]
 crbug.com/417782 paint/invalidation/compositing/iframe-inside-squashed-layer.html [ Failure ]
 crbug.com/417782 paint/invalidation/filters/filter-on-html-element-with-fixed-position-child.html [ Failure ]
 crbug.com/417782 [ Mac Win ] paint/invalidation/reflection/reflection-with-rotation.html [ Failure ]