preserve comments past the #include ""

Tacking on parts[2] lets us keep things like IWYU comments

    #include "something.h" // IWYU pragma: keep

Rerun the script too... not much interesting.

Change-Id: I9f02c81ffece0ecf3e99730d4a12d49e01417ddc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/213697
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Mike Klein <mtklein@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
15 files changed