PDF has been a supported format for awhile now and we should track it's performance.

For starters, I think we should track the time it takes from page load to render the first page of a PDF. We can use the event 'pagerendered' and it's timestamp that PDF.js emits.

Dependent on https://github.com/mozilla/pdf.js/pull/10966 being merged.

Adds a new pageload test that captures the "pagerendered" event from
PDF.js.

One last thing before I land, I noticed the task "o-p" is broken on my try run. Is that broken already or something I need to fix?

it has been broken for a while, I looked at the log and your test ran fine!

Backed out changeset 1da5d33b44db (bug 1565680) for talos failures

Backout: https://hg.mozilla.org/integration/autoland/rev/238dcddad8380e93a8527c1bb775ac35f19509c7

Failure push: https://treeherder.mozilla.org/#/jobs?repo=autoland&revision=1da5d33b44db21efa573077bf92db892c61ae039

Failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=257470259&repo=autoland&lineNumber=2196

21:53:17 INFO - TEST-START | sessionrestore
21:53:17 INFO - Initialising browser for sessionrestore test...
21:53:17 INFO - Cloning profile located at /home/cltbld/tasks/task_1563567462/build/tests/talos/talos/startup_test/sessionrestore/profile
21:53:17 INFO - Merging profile: /home/cltbld/tasks/task_1563567462/build/tests/talos/talos/profile_data/base
21:53:17 INFO - Merging profile: /home/cltbld/tasks/task_1563567462/build/tests/talos/talos/profile_data/common
21:53:17 INFO - Merging profile: /home/cltbld/tasks/task_1563567462/build/tests/talos/talos/profile_data/perf
21:53:17 INFO - Installing Add-ons:
21:53:17 INFO - ['/home/cltbld/tasks/task_1563567462/build/tests/talos/talos/talos-powers', '/home/cltbld/tasks/task_1563567462/build/tests/talos/talos/startup_test/sessionrestore/addon']
21:53:17 INFO - Application command: /home/cltbld/tasks/task_1563567462/build/application/firefox/firefox http://127.0.0.1:39199/getInfo.html -profile /tmp/tmp0y2eDE/profile
21:53:17 INFO - TEST-INFO | started process 9126 (/home/cltbld/tasks/task_1563567462/build/application/firefox/firefox http://127.0.0.1:39199/getInfo.html)
21:53:17 INFO - 1563573197649 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: mozillaAddons
21:53:17 INFO - 1563573197650 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: telemetry
21:53:17 INFO - 1563573197650 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: resource://pdf.js/
21:53:17 INFO - 1563573197650 addons.webextension.screenshots@mozilla.org WARN Loading extension 'screenshots@mozilla.org': Reading manifest: Invalid extension permission: about:reader*
21:53:18 INFO - __metrics Screen width/height: 1600/1200
21:53:18 INFO - colorDepth: 24
21:53:18 INFO - Browser inner width/height: 1440/800
21:53:18 INFO - __metrics
21:53:18 INFO - ATTENTION: default value of option force_s3tc_enable overridden by environment.
21:53:18 INFO - WebGL(0x7fcde0284800)::ForceLoseContext
21:53:18 INFO - WebGL(0x7fcddc50c000)::ForceLoseContext
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21:53:19 INFO - JavaScript error: moz-extension://45f5f53d-f003-4310-ae30-4119cdb82643/chrome/talos-powers-content.js, line 15: NS_ERROR_ILLEGAL_VALUE:

The pdf file was somehow truncated with uploading. Hopefully it is fixed now.

Backed out changeset 0052568cf710 (bug 1565680) for talos failures

Backout: https://hg.mozilla.org/integration/autoland/rev/4b0ce459b34da2b77579809dae76c65a3597f5cd

Failure push: https://treeherder.mozilla.org/#/jobs?repo=autoland&revision=0052568cf7101c0856d1a48f5532f40b5ba63739.

Failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=258157409&repo=autoland&lineNumber=2479

task 2019-07-24T18:58:47.782Z] 18:58:47 INFO - ATTENTION: default value of option force_s3tc_enable overridden by environment.
[task 2019-07-24T18:58:47.789Z] 18:58:47 INFO - WebGL(0x7f240c307800)::ForceLoseContext
[task 2019-07-24T18:58:47.797Z] 18:58:47 INFO - WebGL(0x7f240c312800)::ForceLoseContext
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feature"}]},{"name":"WEBRENDER_QUALIFIED","description":"WebRender qualified","status":"blacklisted","log":[{"type":"default","status":"available"},{"type":"env","status":"blacklisted","message":"No qualified hardware"}]},{"name":"OMTP","description":"Off Main Thread Painting","status":"available","log":[{"type":"default","status":"available"}]}],"fallbacks":[]},"crashGuards":[]},"extensions":[{"name":"Session Restore Startup Performance Test","version":"2.1","isActive":true,"id":"session-restore-test-2@mozilla.org"},{"name":"Talos Powers","version":"1.1","isActive":true,"id":"talos-powers@mozilla.org"}],"features":[{"name":"Firefox Monitor","version":"3.0","id":"fxmonitor@mozilla.org"},{"name":"Firefox Screenshots","version":"39.0.0","id":"screenshots@mozilla.org"},{"name":"Form Autofill","version":"1.0","id":"formautofill@mozilla.org"},{"name":"Web Compat","version":"4.4.0","id":"webcompat@mozilla.org"},{"name":"WebCompat Reporter","version":"1.1.0","id":"webcompat-reporter@mozilla.org"}]}JavaScript error: resource://gre/modules/sessionstore/PrivacyFilter.jsm, line 121: TypeError: tab is undefined
[task 2019-07-24T18:58:48.364Z] 18:58:48 INFO - JavaScript error: moz-extension://ea2c7a54-ea21-40bf-b272-6d134db86c11/chrome/talos-powers-content.js, line 15: NS_ERROR_ILLEGAL_VALUE:
[task 2019-07-24T18:58:48.896Z] 18:58:48 INFO - TEST-INFO | 10151: exit 0

Looks like I messed up the upstream changed and had "timestamp" for the pagerendered event instead of "time".

Looks good now:
https://treeherder.mozilla.org/#/jobs?repo=try&revision=ec2f9564fc9ca0d428d114a866a60c69b0febb61

Another log failure: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=258162386&repo=autoland&lineNumber=2598

https://hg.mozilla.org/mozilla-central/rev/0544602756cb