add src/opts headers to .gni files

Chrome's analyze step uses GN and doesn't see changes
to these files as mattering to anything.

I've kept the ones particular to old style opts in
each of their particular targets, and the ones that
are included multiple times (including from outside
src/opts) in core.  Kind of arbitrary, but it's at
least close to the right slicing.

Change-Id: I2a5aaeca5b6287c13d7365ec1b63158f48e4e84a
Reviewed-on: https://skia-review.googlesource.com/152040
Reviewed-by: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
3 files changed