Issue 48832. Watch only resource included into ContextRoot.
Issue 48832. Watch only resource included into ContextRoot.

This does not solve all the problems, but might be enough for a
specific problem of analyzing a single file.

Bug: https://github.com/dart-lang/sdk/issues/48832
Change-Id: I02bfbf19fdbd6e8b848efdb76c355363bf2b86eb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/241983
Reviewed-by: Samuel Rawlins <5cf2cac5eec2ad6d0eb2b0f4ff6af9a590ce2bf6@google.com>
Commit-Queue: Konstantin Shcheglov <09e4d7516628963212bf4aace2f97603d2b706e4@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk