runtime/BUILD.gn and ..core/BUILD.gn use flutter_runtime_mode which is defined in common.gni. If the build comes through common/BUILD.gn this is imported (implicity) but builds that depend on specific files, like the Fuchsia build, won't have this imported. This imports the gni from the build files that use it instead of relying on it already being there.
Flutter Engine
Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.
Flutter is an early-stage open-source project. We are still missing core features like accessibility, text input, localization, and more. However, you can build demos and examples today. We hope you try it out and send us feedback.
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For information about using Flutter to build apps, please see the getting started guide.
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For information about contributing to the Flutter framework, please see the main Flutter repository.
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For information about contributing code to the engine itself, please see CONTRIBUTING.md.
Community
Join us in our Gitter chat room or join our mailing list, flutter-dev@googlegroups.com.