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chromium / chromium / src / e4b2e8234742701111a5fb412e406b7e9a91c70b / . / chromeos
tree: 9c21cf9d34a5051f394644cb6c7290059824867d [path history] [tgz]
  1. assistant/
  2. attestation/
  3. audio/
  4. chromeos_strings_grd/
  5. components/
  6. crosapi/
  7. cryptohome/
  8. dbus/
  9. disks/
  10. geolocation/
  11. hugepage_text/
  12. ime/
  13. lacros/
  14. login/
  15. memory/
  16. network/
  17. policy/
  18. printing/
  19. process_proxy/
  20. profiles/
  21. resources/
  22. scanning/
  23. services/
  24. settings/
  25. startup/
  26. strings/
  27. system/
  28. test/
  29. third_party/
  30. timezone/
  31. tools/
  32. tpm/
  33. ui/
  34. BUILD.gn
  35. chromeos_export.h
  36. CHROMEOS_LKGM
  37. chromeos_strings.grd
  38. DEPS
  39. DIR_METADATA
  40. LACROS_OWNERS
  41. OWNERS
  42. README.md
  43. SECURITY_OWNERS
  44. tast_control.gni
chromeos/README.md

Chrome OS

This directory contains low-level support for Chrome running on Chrome OS.

The Lacros project is in the process of extracting the browser-functionality into a separate binary. This introduces the following terminology and rules:

  • ash-chrome: The new name of the legacy “chrome” binary. It contains system UI and the current/legacy web browser. Code that is only used by ash-chrome should eventually be moved to //ash, have an _ash suffix in the filename, or have a (grand-)parent directory named /ash/.
  • lacros-chrome: The name of the new, standalone web-browser binary. Code that is only used by lacros-chrome should have a _lacros suffix in the filename, or have a (grand-)parent directory named /lacros/.
  • crosapi: The term “crosapi” is short for ChromeOS API. Ash-chrome implements the API, and lacros-chrome is the only consumer.
  • chromeos: The term “chromeos” refers to code that is shared by binaries targeting the chromeos platform or using the chromeos toolchain. Code that is shared by ash-chrome and lacros-chrome should have a _chromeos suffix in the filename, or have a (grand-)parent directory named /chromeos/.
  • Exception: The exception to the rule is //chrome/browser/chromeos. Following existing conventions in //chrome, the directory should refer to lacros-chrome. However, this would involve a massive and otherwise unnecessary refactor. //chrome/browser/chromeos will continue to contain code that is only used by ash-chrome. //chrome/browser/lacros will contain code used only by lacros-chrome. See this document for more details.

Many subdirectories contain Chrome-style C++ wrappers around operating system components.

For example, //chromeos/dbus contains wrappers around the D-Bus interfaces to system daemons like the network configuration manager (shill). Most other directories contain low-level utility code. For example, //chromeos/disks has utilities for mounting and unmounting disk volumes.

There are two exceptions:

  • //chromeos/services contains mojo services that were not considered sufficiently general to live in top-level //services. For example //chromeos/services/secure_channel bootstraps a secure communications channel to an Android phone over Bluetooth, enabling multi-device features like instant tethering.

  • //chromeos/components contains C++ components that were not considered sufficiently general to live in top-level //components. For example, //ash/components/account_manager manages the user's GAIA accounts, but is used as the backend for UI that only exists on Chrome OS devices.

Note, //chromeos does not contain any user-facing UI code, and hence it has “-ui” in its DEPS. The contents of //chromeos should also not depend on //chrome or //content.