Use allowed_experiments.json when building SDK summary.

Change-Id: I3fd73d9890d62cc7b3c19e061069979a6b65c9b7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149052
Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>

https://dart.googlesource.com/sdk/+/97d94129964ec05475229b87d9514feefd20bbfc
1 file changed
tree: b855ae5e87e0ade6f074c7606b855d98bf28375a
  1. commits.json