third_party/blink: specify missing python scripts inputs

This moves input specification of python scripts from siso config to GN
config.

Bug: 330095451
Change-Id: Ia450a168d5b3da02a6d36a7e8a937f949405a8a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5826176


Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1349167}