Add colors for styling input fields
Add colors for styling input fields

This CL adds new variables to be used to style
input elements.

Bug: none
Change-Id: I10b02fb3c0c16fb3a301d6c025fecf3f23477837
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3041379
Reviewed-by: Peter Müller <296389d11343900e76d73969c719e93a67ee1bb5@chromium.org>
Reviewed-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>
Commit-Queue: Alex Rudenko <d8d88e7d7e77f69e23d1d1432231196fb8e02a62@chromium.org>

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