tree: 9a63fab1e2dd76540ff510ea62b3052c67fda14a [path history] [tgz]
  1. BUILD.gn
  2. CHROMEOS_LKGM
  3. DEPS
  4. DIR_METADATA
  5. LACROS_OWNERS
  6. OWNERS
  7. README.md
  8. SECURITY_OWNERS
  9. assistant/
  10. attestation/
  11. audio/
  12. chromeos_export.h
  13. chromeos_strings.grd
  14. chromeos_strings_grd/
  15. components/
  16. constants/
  17. crosapi/
  18. cryptohome/
  19. dbus/
  20. disks/
  21. geolocation/
  22. hugepage_text/
  23. ime/
  24. lacros/
  25. login/
  26. memory/
  27. network/
  28. policy/
  29. printing/
  30. process_proxy/
  31. profiles/
  32. resources/
  33. scanning/
  34. services/
  35. settings/
  36. strings/
  37. system/
  38. test/
  39. third_party/
  40. timezone/
  41. tools/
  42. tpm/
  43. ui/
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, //chromeos/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.