Revert "Remove old references to SampleApp"

This reverts commit 1c477fc263cf37c27cd92740d9328445420a926d.

Reason for revert: Botpocalypse.
Original change's description:
> Remove old references to SampleApp
> 
> Docs-Preview: https://skia.org/?cl=135570
> Change-Id: I330ffa964c2d90ca8d3cd844aabcd8616ccd0540
> Reviewed-on: https://skia-review.googlesource.com/135570
> Reviewed-by: Cary Clark <caryclark@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>

TBR=halcanary@google.com,brianosman@google.com,caryclark@google.com

Change-Id: I514e2c7bca8a1ebd311593573a94e8a078695785
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/135600
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
7 files changed