Roll DevTools Frontend from 54c26addfe46 to 977eeb69af7b (2 revisions)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/54c26addfe46..977eeb69af7b

2020-12-11 vmpstr@chromium.org Add content-visibility information for node highlight.
2020-12-11 sigurds@chromium.org Refactor ExpandableApplicationPanelTreeElement

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:1147510,chromium:1157484
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: Ibb3b1803836a96ab3228f7ac234b8115a0bb1831
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586103Reviewed-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@{#836202}

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': '54c26addfe463035e33c06c17cc8d58638eca098',
+  'devtools_frontend_revision': '977eeb69af7b9ffbfe76586a5270d5c813ce2f16',
   # 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.