[coverage] Remember last used coverage type
[coverage] Remember last used coverage type

R=38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org

Fixed: chromium:1061386
Change-Id: Iffc6dffa73e83ae2a7bede094356871ad160f2e7
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2105435
Reviewed-by: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>
Commit-Queue: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>

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