Ozone-Demo: Split helpers into their own files

Move classes into their own files so they may be used in different
targets.

Bug: b/76099793
Test: Compiled
Change-Id: I2d484cc2fff872fac7cdba3a6d2eaf7573a1b1f0
Reviewed-on: https://chromium-review.googlesource.com/976627
Reviewed-by: Alex Sakhartchouk <[email protected]>
Commit-Queue: Daniel Nicoara <[email protected]>
Cr-Commit-Position: refs/heads/master@{#545267}
8 files changed