This CL unblocks the internal SDK roll by restoring the migration
tool's `MigrationCli.addCoreOptions` method (which is currently used
internally). It also adds a replacement, `MigrationCli.options`,
which is more robust because it allows the client to choose which
options to include and which options to exclude.
Once this CL has rolled in, I'll update the internal code base to use
the new `MigrationCli.options` method and then remove the deprecated
`addCoreOptions` method.
Change-Id: I3ddbd935c3858c3302a2ad2b825b97df96249043
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/167443
Reviewed-by: Samuel Rawlins <srawlins@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Paul Berry
63a406d78b