Mark devtools/tracing tests disabled due to flakiness

Mark four tests as disabled:
virtual/threaded/http/tests/devtools/tracing/timeline-time/timeline-usertiming.js
virtual/threaded/http/tests/devtools/tracing/timeline-paint/timeline-paint-and-multiple-style-invalidations.js

http/tests/devtools/tracing/timeline-js/timeline-script-id.js
due to flake here:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win7%20Tests%20%28dbg%29%281%29/69598

virtual/threaded/http/tests/devtools/tracing/timeline-misc/ imeline-event-causes.js
due to flake here:
https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Mac10.11%20%28dbg%29/16773

NOTRY=true
TBR=kozyatinskiy@chromium.org

Bug: 850892
Change-Id: I6918161001cd3c4fd537476406d0ff66183096f4
Reviewed-on: https://chromium-review.googlesource.com/1093456
Commit-Queue: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565733}

third_party/WebKit/LayoutTests/TestExpectations

@@ -4796,6 +4796,10 @@ crbug.com/849978 http/tests/devtools/elements/styles-4/stylesheet-source-url-com
 # Sheriff 2018-06-08
 crbug.com/850892 http/tests/devtools/tracing/timeline-time/timeline-usertiming.js [ Pass Failure ]
 crbug.com/850892 http/tests/devtools/tracing/console-timeline.js [ Pass Failure ]
+crbug.com/850892 http/tests/devtools/tracing/timeline-js/timeline-script-id.js [ Pass Failure ]
+crbug.com/850892 virtual/threaded/http/tests/devtools/tracing/timeline-misc/timeline-event-causes.js [ Pass Failure ]
+crbug.com/850892 virtual/threaded/http/tests/devtools/tracing/timeline-time/timeline-usertiming.js [ Pass Failure ]
+crbug.com/850892 virtual/threaded/http/tests/devtools/tracing/timeline-paint/timeline-paint-and-multiple-style-invalidations.js [ Pass Failure ]
 # The following test is known to timeout due to crbug.com/760543.
 crbug.com/850892 http/tests/devtools/tracing/timeline-style/timeline-style-recalc-all-invalidator-types.js [ Pass Timeout Failure ]
 crbug.com/851090 virtual/mouseevent_fractional/fast/events/middleClickAutoscroll-click-hyperlink.html [ Pass Failure ]