[mediaplayer] fix panic in mediaplayer_test_util

This CL fixes a panic that occurs in mediaplayer_test_util when
mediaplayer is destroyed by e.g. killall mediaplayer.cmx. The
member variable |video_view_holder_| is cleared when the view
dies and subsequently dereferenced in the Layout method. This
change adds a guard to the top of Layout to prevent it from
running when |video_view_holder_| is null and causes the utility
to quit in this case.

TEST: fx shell present_view \
  fuchsia-pkg://fuchsia.com/mediaplayer_test_util#meta/mediaplayer_test_util.cmx \
  --loop \
  https://ia800903.us.archive.org/4/items/BigBugBunny_AVCHD/bigBuckBunny_avchd_720p.mp4
      fx shell killall mediaplayer.cmx
Change-Id: Ia38a9f0fcdc0ab083f27a56351030fc92ac1014f
1 file changed
tree: f98aae431505138fb213c1cceb3c5cab53b273c0
  1. boards/
  2. build/
  3. buildtools/
  4. bundles/
  5. docs/
  6. examples/
  7. garnet/
  8. infra/
  9. peridot/
  10. products/
  11. scripts/
  12. sdk/
  13. src/
  14. third_party/
  15. tools/
  16. zircon/
  17. .clang-format
  18. .clang-tidy
  19. .dir-locals.el
  20. .gitattributes
  21. .gitignore
  22. .gn
  23. AUTHORS
  24. BUILD.gn
  25. CODE_OF_CONDUCT.md
  26. CONTRIBUTING.md
  27. LICENSE
  28. OWNERS
  29. PATENTS
  30. README.md
  31. rustfmt.toml
README.md

Fuchsia

Pink + Purple == Fuchsia (a new operating system)

What is Fuchsia?

Fuchsia is a modular, capability-based operating system. Fuchsia runs on modern 64-bit Intel and ARM processors.

Fuchsia is an open source project with a code of conduct that we expect everyone who interacts with the project to respect.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See the documentation.