Dart dependency in Fuchsia

The Fuchsia build pulls a version of the Dart SDK that matches the version used in Flutter. The revision field in dart should match the dart_revision value in Flutter's DEPS file. The other entries in dart and dart_third_party_pkg should correspond to the values in the Dart SDK DEPS file.

Updating Fuchsia's version of Dart

• Update flutter/engine.
• Update the dart manifest's revision field of the dart/sdk entry:

  jiri edit -project=dart/sdk=123abcdef topaz/manifest/dart
  

• If needed, update the other revision fields in the dart manifest:

  jiri edit -project=observatory_pub_packages=456abcdef topaz/manifest/dart
  

• Update your local tree by running jiri update -local-manifest=true.
  • This will run a hook that:
    • Verifies the prebuilts are ready for all host platforms.
    • Downloads the prebuilt for the current host platform.
  • If this fails:
    • Check on Fuchsia's prebuilt Dart builder bots.
      • If they're still running for your chosen revision, wait for them to finish and then try again later.
    • Ask fuchsia-toolchain@ for help.
• Update the dart_third_party_pkg manifest by running //third_party/dart/tools/create_pkg_manifest.py.
• Build and verify that everything works.
• Land the changes.

The manifests dart_head and dart_third_party_pkg_head pull the Dart SDK sources from top-of-tree. dart_third_party_pkg_head will need to be periodically updated with //third_party/dart/tools/create_pkg_manifest.py as well.