getOccurrencesRequest method
Return the occurrences request that should be passes to the contributors returned from getOccurrencesContributors.
Throw a RequestFailure if the request could not be created.
Implementation
@override
Future<OccurrencesRequest> getOccurrencesRequest(String path) async {
var result = await getResolvedUnitResult(path);
return DartOccurrencesRequestImpl(resourceProvider, result);
}