Include comments when parsing with Fasta in file_state.
Include comments when parsing with Fasta in file_state.

This makes many inference tests pass, because they use comments to
annotate expected errors.

The number of unit tests that are failing now (with this CL): 269.

R=paulberry@google.com
BUG=

Review-Url: https://codereview.chromium.org/2777613002 .

dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk