Shared Storage: Allow perf test xvfb option to find available server num

We copy the short xvfb script from py_utils in catapult to the new
utils module in tools/perf/contrib/shared_storage so that we can
insert logic to find an available server number in the case that the
default is already in use.

This allows us to avoid an error when trying to use the xvfb option
e.g. in two terminals at once, or after the previous use ended in
an exception and so failed to properly terminate the xvfb process.

(Note that in the latter example above, manual cleanup is possible.)

Bug: 1516507,1218540
Change-Id: Ide742791c0782695faa62ea61c2e97258c729d0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5332153
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Cammie Smith Barnes <cammie@chromium.org>
Reviewed-by: Yao Xiao <yaoxia@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1267238}
4 files changed
tree: c29b1a4c677bd7bed3519f1e9036d60893b0f7dc
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. codelabs/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. webkit/
  51. .clang-format
  52. .clang-tidy
  53. .clangd
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitallowed
  57. .gitattributes
  58. .gitignore
  59. .gitmodules
  60. .gn
  61. .mailmap
  62. .rustfmt.toml
  63. .vpython3
  64. .yapfignore
  65. ATL_OWNERS
  66. AUTHORS
  67. BUILD.gn
  68. CODE_OF_CONDUCT.md
  69. codereview.settings
  70. DEPS
  71. DIR_METADATA
  72. LICENSE
  73. LICENSE.chromium_os
  74. OWNERS
  75. PRESUBMIT.py
  76. PRESUBMIT_test.py
  77. PRESUBMIT_test_mocks.py
  78. README.md
  79. WATCHLISTS
README.md

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