This directory contains a stable Dart SDK, which is used to build the observatory and to run the test scripts. The DEPS use CIPD's ${platform} syntax find the right SDK for the platform. We use the x64 build as the default on Linux, Mac and Windows. Builds for Linux on ARM and ARM64 are also provided. To upload new versions of these CIPD packages, run "./update.sh" in this directory. Because these SDKs are used for the presubmit dart format check on changed files, they may need to be updated often when dart format is changing rapidly. Access to the project-dart-admins Luci auth group is required to do so.