Roll src/third_party/devtools-frontend/src 08d6811df4d8..221a8f9481b7 (5 commits)

https://chromium.googlesource.com/devtools/devtools-frontend.git/+log/08d6811df4d8..221a8f9481b7

git log 08d6811df4d8..221a8f9481b7 --date=short --first-parent --format='%ad %ae %s'
2020-05-12 bmeurer@chromium.org [CXXDWARFSymbols] Make watchdog optional.
2020-05-12 morlovich@chromium.org UA-CH emulation: fix brand for Chrome
2020-05-12 tvanderlippe@chromium.org Use Ninja copy action instead of build_release_applications.py to copy HTML entrypoints
2020-05-12 wolfi@chromium.org Add background color to gutter for breakpoints
2020-05-12 alexrudenko@chromium.org Typecheck HARLog.js

Created with:
  gclient setdep -r src/third_party/devtools-frontend/src@221a8f9481b7

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/+/master/autoroll/README.md

Bug: chromium:1011811,chromium:1041830,chromium:1042636,chromium:1073909,chromium:1078770,chromium:1079233
Tbr: devtools-waterfall-sheriff-onduty@grotations.appspotmail.com
Change-Id: I318fa720d44b6af444bf3b1f7ca3d7d5e4d08d27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2195915Reviewed-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@{#767772}

DEPS

@@ -249,7 +249,7 @@ 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': '08d6811df4d88dd0ba6e63814dab451bda91730f',
+  'devtools_frontend_revision': '221a8f9481b75868de3f2a3e2bfd662b53a0a6f3',
   # 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.