Implement dark mode for ReportView component
Implement dark mode for ReportView component

The initial prototype re-used the colors from ReportView.js. This CL
updates the colors to use the CSS variables that work with light/dark
mode out of the box.

Screenshots: https://imgur.com/a/OtUV5ES

R=993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org

Bug:chromium:1126824, chromium:1152736
Change-Id: I1df1b96265a5c685c5b04880635769ec28b1f25d
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2566800
Commit-Queue: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>
Reviewed-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

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