[PWA/AppUpdating]: Add feature flag for policy and default app updating

This CL creates a feature flag that allows predictable app updating to
happen for policy and default installed apps.

Policy and default apps will be silently updated if the developer
changes the manifest. This includes silently updating for security and
non-security sensitive fields.

This is part of the implementation for predictable app updating. More
details: go/predictable-app-updating-design-doc

Bug: 432538732
Change-Id: Ie502efa95ed2f0409519a4c1b2141e385564c663
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6766037
Commit-Queue: Dibyajyoti Pal <dibyapal@chromium.org>
Reviewed-by: Dibyajyoti Pal <dibyapal@chromium.org>
Commit-Queue: May Siem <msiem@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1489788}
2 files changed
tree: 6f582474b31ad64e615eeaa5e4e4cb58f1d284b4
  1. .github/
  2. agents/
  3. android_webview/
  4. apps/
  5. ash/
  6. base/
  7. build/
  8. build_overrides/
  9. buildtools/
  10. cc/
  11. chrome/
  12. chromecast/
  13. chromeos/
  14. codelabs/
  15. components/
  16. content/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia_web/
  23. gin/
  24. google_apis/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. net/
  33. pdf/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .cursorignore
  53. .git-blame-ignore-revs
  54. .gitallowed
  55. .gitattributes
  56. .gitignore
  57. .gitmodules
  58. .gn
  59. .mailmap
  60. .rustfmt.toml
  61. .vpython3
  62. .yapfignore
  63. ATL_OWNERS
  64. AUTHORS
  65. BUILD.gn
  66. CODE_OF_CONDUCT.md
  67. codereview.settings
  68. CPPLINT.cfg
  69. CRYPTO_OWNERS
  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. SECURITY_OWNERS
  80. WATCHLISTS
README.md

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