[root layer scrolls] Update expectations

paint/invalidation/svg/js-update-stop-linked-gradient.svg:
This test was recently updated which removed gradient stops:
https://chromium.googlesource.com/chromium/src/+/e3276a9902608cd3930d2a1dad67d56b5ae98313
This patch updates the RLS expectation too.

http/tests/devtools/agents-enable-disable.js (and virtual variant):
This test is crashing on all platforms but the expectation was marked as
timeout on just mac.

plugins/mouse-events-fixedpos.html:
This test is crashing flakily (see: https://crbug.com/786117).

To make it easier to update the expectations file, a new section for
flaky tests has been added.

Bug: 781419, 786117

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls
Change-Id: Iba1f45b03a1ac2093c48a2cfcabf70c6f93a9d4d
Reviewed-on: https://chromium-review.googlesource.com/779760
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518353}

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

@@ -24,7 +24,6 @@ crbug.com/417782 fast/events/drag-and-drop-autoscroll-frameset.html [ Timeout ]
 crbug.com/417782 fast/events/drag-and-drop-autoscroll-inner-frame.html [ Timeout ]
 crbug.com/417782 fast/events/drag-and-drop-autoscroll-mainframe.html [ Timeout ]
 crbug.com/417782 fast/events/pointerevents/pointer-event-mouse-coords-in-zoom-and-scroll.html [ Failure ]
-crbug.com/417782 fast/events/pointerevents/pointer-event-pen-coords-in-zoom-and-scroll.html [ Failure Timeout ]
 crbug.com/417782 fast/events/scale-and-scroll-iframe-window.html [ Failure ]
 crbug.com/417782 fast/events/touch/gesture/gesture-tap-frame-scrolled.html [ Failure ]
 crbug.com/417782 fast/events/touch/gesture/gesture-tap-scrolled.html [ Failure ]
@@ -45,7 +44,6 @@ crbug.com/417782 [ Linux Mac ] fast/spatial-navigation/snav-iframe-with-offscree
 crbug.com/417782 [ Linux Mac ] fast/spatial-navigation/snav-media-elements.html [ Failure ]
 crbug.com/417782 [ Linux ] fast/spatial-navigation/snav-unit-overflow-and-scroll-in-direction.html [ Failure ]
 crbug.com/417782 html/dialog/form-method-dialog.html [ Crash ]
-crbug.com/417782 [ Mac ] http/tests/devtools/agents-enable-disable.js [ Timeout ]
 crbug.com/417782 http/tests/devtools/device-mode/default-background-color.html [ Failure ]
 crbug.com/417782 http/tests/devtools/layers/layer-compositing-reasons.html [ Failure ]
 crbug.com/417782 http/tests/devtools/layers/layer-scroll-rects-get.html [ Failure ]
@@ -86,13 +84,11 @@ crbug.com/417782 [ Linux ] virtual/android/fullscreen/compositor-touch-hit-rects
 crbug.com/417782 [ Linux ] virtual/android/fullscreen/full-screen-iframe-allowed-video.html [ Failure ]
 crbug.com/417782 [ Linux ] virtual/android/fullscreen/video-controls-timeline.html [ Failure ]
 crbug.com/417782 [ Linux ] virtual/android/fullscreen/video-scrolled-iframe.html [ Failure ]
-crbug.com/417782 [ Mac ] virtual/mojo-loading/http/tests/devtools/agents-enable-disable.js [ Timeout ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/device-mode/default-background-color.html [ Failure ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/layers/layer-compositing-reasons.html [ Failure ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/layers/layer-scroll-rects-get.html [ Failure ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/layers/layer-tree-model.html [ Failure ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/layers/layers-3d-view-hit-testing.html [ Failure ]
-crbug.com/417782 virtual/mojo-loading/http/tests/devtools/tracing/scroll-invalidations.html [ Crash Failure ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/tracing/timeline-paint/layer-tree.js [ Failure ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/tracing/timeline-paint/paint-profiler-update.js [ Timeout ]
 crbug.com/417782 virtual/mojo-loading/http/tests/devtools/tracing/timeline-paint/timeline-paint-and-multiple-style-invalidations.js [ Failure ]
@@ -126,9 +122,6 @@ crbug.com/417782 virtual/threaded/printing/thead-repeats-at-top-of-each-page.htm
 crbug.com/417782 compositing/iframes/iframe-composited-scrolling.html [ Failure ]
 crbug.com/417782 compositing/squashing/dont-squash-into-videos.html [ Failure ]
 crbug.com/417782 virtual/mouseevent_fractional/fast/events/autoscroll.html [ Failure ]
-crbug.com/417782 virtual/mouseevent_fractional/fast/events/drag-and-drop-autoscroll-frameset.html [ Timeout Failure ]
-crbug.com/417782 virtual/mouseevent_fractional/fast/events/drag-and-drop-autoscroll-inner-frame.html [ Timeout Failure ]
-crbug.com/417782 virtual/mouseevent_fractional/fast/events/drag-and-drop-autoscroll-mainframe.html [ Timeout Failure ]
 crbug.com/417782 virtual/mouseevent_fractional/fast/events/mouse-coords-in-zoom-and-scroll.html [ Failure ]
 crbug.com/417782 virtual/mouseevent_fractional/fast/events/mouse-right-coords-in-zoom-and-scroll-right.html [ Failure ]
 crbug.com/417782 virtual/mouseevent_fractional/fast/events/scale-and-scroll-iframe-window.html [ Failure ]
@@ -140,5 +133,15 @@ crbug.com/417782 virtual/mouseevent_fractional/fast/events/touch/touch-inside-if
 crbug.com/417782 virtual/mouseevent_fractional/fast/events/touch/gesture/gesture-tap-frame-scrolled.html [ Failure ]
 crbug.com/417782 virtual/mouseevent_fractional/fast/events/touch/gesture/gesture-tap-scrolled.html [ Failure ]
 
+# Tests known to be flaky
+crbug.com/417782 virtual/mouseevent_fractional/fast/events/drag-and-drop-autoscroll-frameset.html [ Timeout Failure ]
+crbug.com/417782 virtual/mouseevent_fractional/fast/events/drag-and-drop-autoscroll-inner-frame.html [ Timeout Failure ]
+crbug.com/417782 virtual/mouseevent_fractional/fast/events/drag-and-drop-autoscroll-mainframe.html [ Timeout Failure ]
+crbug.com/417782 fast/events/pointerevents/pointer-event-pen-coords-in-zoom-and-scroll.html [ Failure Timeout ]
+crbug.com/417782 http/tests/devtools/agents-enable-disable.js [ Timeout Crash ]
+crbug.com/417782 virtual/mojo-loading/http/tests/devtools/agents-enable-disable.js [ Timeout Crash ]
+crbug.com/786117 [ Linux ] plugins/mouse-events-fixedpos.html [ Pass Crash ]
+crbug.com/417782 virtual/mojo-loading/http/tests/devtools/tracing/scroll-invalidations.html [ Crash Failure ]
+
 # Virtual test suites to skip.
 crbug.com/417782 virtual/spv175 [ Skip ]

third_party/WebKit/LayoutTests/flag-specific/root-layer-scrolls/paint/invalidation/svg/js-update-stop-linked-gradient-expected.txt

@@ -35,10 +35,6 @@
     }
   ],
   "objectPaintInvalidations": [
-    {
-      "object": "LayoutSVGGradientStop stop id='stop1'",
-      "reason": "disappeared"
-    },
     {
       "object": "LayoutSVGRect rect",
       "reason": "SVG resource change"