Fix high contrast in Coverage panel
Fix high contrast in Coverage panel

You are now able to see usage bar in the grid and the foreground
of the percentage text is set to the correct color on focused.

Before: https://imgur.com/a/NmTkhcl
After: https://imgur.com/a/lCJ7kWn

Bug: 1048378
Change-Id: I1512f8f07d9ca5f5003becacdd27745c5330326e
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2081872
Commit-Queue: Kham Udom <34bb5bbdbfb9bef82d339b3169774613c47d25f2@microsoft.com>
Reviewed-by: Mathias Bynens <17a2cbc4e33156874a9862b0f530521117e66a3d@chromium.org>

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