Roll DevTools Frontend from 9e7836c35d48 to c21938dd6e41 (5 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/9e7836c35d48..c21938dd6e41

2020-12-08 andoli@chromium.org [module.json extensions] Add "Duplicate element" action to elements-meta.ts
2020-12-08 kimanh@chromium.org [LMI] Refresh data in LMI on Debugger.pause and on revealing the tab
2020-12-08 andoli@chromium.org Change extensions' `tags` field to array
2020-12-08 devtools-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Update DevTools DEPS.
2020-12-08 tvanderlippe@chromium.org [module.json extensions] Add support for ContextMenu providers

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/devtools-frontend-chromium
Please CC devtools-waterfall-sheriff-onduty@grotations.appspotmail.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: chromium:1110202,chromium:1134103
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I8cd5e65cb26802ba68316a8618892e2c85d113f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578923Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#834700}

DEPS

@@ -274,7 +274,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling devtools-frontend
   # and whatever else without interference from each other.
-  'devtools_frontend_revision': '9e7836c35d4868198f7d75daf862e456fcdcc9f3',
+  'devtools_frontend_revision': 'c21938dd6e4184a6201d450f9fe74e38050b9d3c',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling libprotobuf-mutator
   # and whatever else without interference from each other.