70a56b3947
`dart pub get` will create a `package_graph.json` now. Ensure this file exists (besides the `package_config.json`). Change-Id: I6ed5e395f101c298a999f51d61b096659db70930 Cq-Include-Trybots: luci.dart.try:pkg-linux-debug-try,pkg-linux-release-arm64-try,pkg-linux-release-try,pkg-mac-release-arm64-try,pkg-win-release-arm64-try,pkg-mac-release-try,pkg-win-release-try Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/428600 Reviewed-by: Michael Goderbauer <goderbauer@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>