Filed by: egao [at] mozilla.com
Parsed log: https://treeherder.mozilla.org/logviewer.html#?job_id=248620603&repo=try
Full log: https://queue.taskcluster.net/v1/task/dJ48vurdQ-24r8cem5CSIg/runs/0/artifacts/public/logs/live_backing.log

Test: mochitest-devtools-chrome
Chunk: 5
Platform: osx1014-mojave

Context:
21:01:40 INFO - TEST-START | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_GRIDS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "CLEAR_FLEXBOX"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "CLEAR_FLEXBOX"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_OFFSET_PARENT"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_LAYOUT"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_OFFSET_PARENT"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_LAYOUT"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_SIDEBAR_SIZE"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:01:41 INFO - GECKO(1731) | console.log: "[DISPATCH] action type:" "UPDATE_ANIMATIONS"
21:02:25 INFO - Not taking screenshot here: see the one that was previously logged
21:02:25 INFO - Buffered messages logged at 21:01:40
21:02:25 INFO - Entering test bound
21:02:25 INFO - Adding a new tab with URL: http://example.com/browser/devtools/client/inspector/animation/test/doc_simple_animation.html
21:02:25 INFO - Tab added and finished loading
21:02:25 INFO - Loading the helper frame script chrome://mochitests/content/browser/devtools/client/inspector/animation/test/doc_frame_script.js
21:02:25 INFO - Loading the helper frame script chrome://mochitests/content/browser/devtools/client/shared/test/frame-script-utils.js
21:02:25 INFO - Sending message Test:RemoveAnimatedElementsExcept to content
21:02:25 INFO - Expecting message Test:RemoveAnimatedElementsExcept from content
21:02:25 INFO - Opening the inspector
21:02:25 INFO - Opening the toolbox
21:02:25 INFO - Buffered messages logged at 21:01:41
21:02:25 INFO - Toolbox opened and focused
21:02:25 INFO - Selecting the animationinspector sidebar
21:02:25 INFO - Check '.compositor-all' animation is still running after even pausing '.animated' animation
21:02:25 INFO - Selecting the node for '.animated'
21:02:25 INFO - Click on pause/resume button
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | State of button should be paused -
21:02:25 INFO - Selecting the node for 'body'
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | Animation 0 should be paused -
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | Animation 1 should be running -
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | State of button is correct -
21:02:25 INFO - Check both animations are paused after clicking pause/resume while displaying both animations
21:02:25 INFO - Click on pause/resume button
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | Animation 0 should be paused -
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | Animation 1 should be paused -
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | State of button is correct -
21:02:25 INFO - Check '.animated' animation is still paused after even resuming '.compositor-all' animation
21:02:25 INFO - Selecting the node for '.compositor-all'
21:02:25 INFO - Click on pause/resume button
21:02:25 INFO - TEST-PASS | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | State of button should be running -
21:02:25 INFO - Selecting the node for 'body'
21:02:25 INFO - Buffered messages finished
21:02:25 INFO - TEST-UNEXPECTED-FAIL | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | Test timed out -
21:02:25 INFO - GECKO(1731) | console.warn: "Error while detaching the thread front: 'detach' request packet to 'server1.conn46.child1/context18' can't be sent as the connection is closed."
21:02:25 INFO - Removing tab.
21:02:25 INFO - Waiting for event: 'TabClose' on [object XULElement].
21:02:25 INFO - Got event: 'TabClose' on [object XULElement].
21:02:25 INFO - Tab removed and finished closing
21:02:25 INFO - GECKO(1731) | MEMORY STAT | vsize 8131MB | residentFast 799MB | heapAllocated 141MB
21:02:25 INFO - TEST-OK | devtools/client/inspector/animation/test/browser_animation_pause-resume-button_respectively.js | took 45259ms

This appears to be an intermittent failure:
https://treeherder.mozilla.org/#/jobs?repo=try&group_state=expanded&revision=bc7c9f12185b0886c45f4bee8713fdc3136e2d46