infra: Switch cros arm64-generic bot to build with the VM-optimized sdk

http://b/303119905 is tracking an effort to enable tests on CrOS
arm64 VMs. For chrome, that's practically this bot:
https://ci.chromium.org/ui/p/chromium/builders/ci/chromeos-arm64-generic-rel

That bot's currently compile-only. So to enable tests, the bot needs a
couple things.

First, it needs to be told to download an OS image to run the tests
on. This is what the "cros_boards_with_qemu_images" gclient var
change does.

Second, it needs to switch to the VM-optimized arm64-generic board.
(This is what the gn_args change does.) The two boards are mostly
identical, except the VM-optimized one produces test images that are
a bit faster when booted via qemu.

After that, the bot should be able to have VM tests added to it
in follow-ups (provided that the tests are green).

Bug: 303119905
Change-Id: I9679bba6181852ab70925ddd55aabfcda8f09e46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5444869
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Struan Shrimpton <sshrimp@google.com>
Cr-Commit-Position: refs/heads/main@{#1286061}
6 files changed
tree: 76e9edcb1cbdc43ad6e1bbc0c4cf5bd9c1b7b962
  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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