paint/invalidation/scroll/scrollbar-damage-and-full-viewport-repaint.html fails on Win10

Text diff

--- C:\b\s\w\iomudyw9\layout-test-results\paint/invalidation/scroll/scrollbar-damage-and-full-viewport-repaint-expected.txt
+++ C:\b\s\w\iomudyw9\layout-test-results\paint/invalidation/scroll/scrollbar-damage-and-full-viewport-repaint-actual.txt
@@ -4,11 +4,21 @@
       "name": "LayoutView #document",
       "bounds": [1000, 600],
       "drawsContent": false,
+      "backgroundColor": "#FFFFFF"
+    },
+    {
+      "name": "Scrolling Layer",
+      "bounds": [1000, 600],
+      "drawsContent": false
+    },
+    {
+      "name": "Scrolling Contents Layer",
+      "bounds": [1000, 600],
       "contentsOpaque": true,
       "backgroundColor": "#FFFFFF",
       "paintInvalidations": [
         {
-          "object": "LayoutBlockFlow DIV id='container'",
+          "object": "HorizontalScrollbar",
           "rect": [1, 236, 185, 15],
           "reason": "scroll control"
         }

Tbr: wangxianzhu@chromium.org
No-try: true
Bug: 919789
Change-Id: Id2bbe29d28fae1b72f64b1deed5649e4ee5ece3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1541616Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644769}

third_party/blink/web_tests/TestExpectations

@@ -6160,7 +6160,7 @@ crbug.com/919789 images/image-zoom-to-500.html [ Pass Timeout ]
 crbug.com/919789 media/controls/overflow-menu-hide-on-resize.html [ Pass Timeout ]
 crbug.com/919789 virtual/video-surface-layer/media/controls/overflow-menu-hide-on-resize.html [ Pass Timeout ]
 crbug.com/919789 paint/invalidation/resize-iframe-text.html [ Pass Timeout ]
-crbug.com/919789 paint/invalidation/scroll/scrollbar-damage-and-full-viewport-repaint.html [ Pass Timeout ]
+crbug.com/919789 paint/invalidation/scroll/scrollbar-damage-and-full-viewport-repaint.html [ Pass Failure Timeout ]
 crbug.com/919789 paint/invalidation/window-resize/ [ Pass Timeout ]
 
 # Sheriff 2019-03-27