SampleAAGeometry tweaks

- Use capital letters avoid conflict with built-in commands,
  particularly zoom-window ('z') and toggle-backend ('d').
- Increase kHitToleranace for touch screens.

Bug: skia:
Change-Id: I6feaabd8aa06600bdeb4623ab081d973369c4841
Reviewed-on: https://skia-review.googlesource.com/52528
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Cary Clark <caryclark@google.com>
1 file changed