43f027fc05
Implements a new request to get reachable sources. This solves a specific issue for flutter (e.g., inferring execution type by checking the transitive closure of reachabe sources for `dart:flutter`) but can be more generallly useful for other client-side smarts (e.g., "is this a web entry point?" or "is this a test?"). More context here: https://github.com/dart-lang/sdk/issues/24893 R=brianwilkerson@google.com, devoncarew@google.com Review URL: https://codereview.chromium.org/1491013002 .