This CL attempts to change System Analyzer to fit
to the dark theme by Material Design.

Link dark theme: https://material.io/design/color/dark-theme.html

Screen Shots: https://imgur.com/a/xWJo1Xb

Change-Id: Ib921febfaaee7aa362495031a174875f442af3a0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2282596Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Sathya Gunasekaran  <gsathya@chromium.org>
Commit-Queue: Zeynep Cankara <zcankara@google.com>
Cr-Commit-Position: refs/heads/master@{#68729}