Use getSourceReport for coverage/callsites in Observatory.

runtime/observatory/tests/service/get_source_report_test.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // VMOptions=--error_on_bad_type --error_on_bad_override
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'dart:developer';
 
@@ skipping 92 matching lines @@
          endsWith('get_source_report_test.dart'));
 
   // Full isolate
   params = { 'reports' : ['Coverage'] };
   coverage = await isolate.invokeRpcNoUpgrade('_getSourceReport', params);
   expect(coverage['type'], equals('SourceReport'));
   expect(coverage['ranges'].length, greaterThan(1));
   expect(coverage['scripts'].length, greaterThan(1));
 
   // Multiple reports (make sure enum list parameter parsing works).
-  params = { 'reports' : ['CallSites', 'Coverage'],
+  params = { 'reports' : ['_CallSites', 'Coverage'],
              'scriptId' : func.location.script.id,
              'tokenPos' : func.location.tokenPos,
              'endTokenPos' : func.location.endTokenPos };
   coverage = await isolate.invokeRpcNoUpgrade('_getSourceReport', params);
   expect(coverage['type'], equals('SourceReport'));
   expect(coverage['ranges'].length, 1);
   var range = coverage['ranges'][0];
   expect(range.containsKey('callSites'), isTrue);
   expect(range.containsKey('coverage'), isTrue);
 
@@ skipping 24 matching lines @@
     expect(e.message,
            "_getSourceReport: the 'endTokenPos' parameter requires the "
            "\'scriptId\' parameter");
   }
   expect(caughtException, isTrue);
 },
 
 ];
 
 main(args) => runIsolateTests(args, tests, testeeConcurrent: testFunction);