Add check for missing visual rect updates and fix failures

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 54cbe6bc59d266c521cbf1f1df456144b92ad868..c709be31654667d0544ce982352342fc56880638 100644
--- a/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2
+++ b/third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2
@@ -317,7 +317,6 @@ 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 ]
@@ -1398,7 +1397,7 @@ crbug.com/644358 compositing/iframes/connect-compositing-iframe-delayed.html [ F
 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 ]