Block non-SysEx MIDI in MIDI host and child process security policy

This CL should not cause any behavior changes as long as the flag
kBlockMidiByDefault is disabled.

As part of gating the entire WebMIDI API behind a permissions prompt,
implement logic to actually prevent sending and receiving all MIDI
messages when the permission is blocked.

This CL follows the existing pattern used for SysEx MIDI messages.

This is a sub-change of crrev.com/c/4410060

Low-Coverage-Reason: We expect the new code to be covered by unittests in crrev.com/c/4410060
Bug: 1420307
Change-Id: I9bdb0a93e8545550651dbf89f35ea96c17009817
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4569305
Commit-Queue: Michael Wilson <mjwilson@chromium.org>
Reviewed-by: Charlie Reis <creis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1151593}
7 files changed
tree: 3609807f2d05364043d5fbcaf7b6d4748197c4aa
  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. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. DEPS
  68. DIR_METADATA
  69. LICENSE
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md
  76. WATCHLISTS
README.md

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