Flutter uses its own DEPS file to checkout dart. To unblock https://dart-review.googlesource.com/c/sdk/+/107837 Dart GN needs to not fail to find build/config/gclient_args.gni even when flutter checks it out. To fix this, this change just adds the same change to Flutter's DEPS so that Flutter will generate the needed GN file for Dart. After this change lands we can reland 107837.
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