Refactor service tests in preparation of running on sky_shell

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 'service_test_common.dart';
 import 'dart:developer';
 
 int globalVar = 100;
 
 class MyClass {
   static void myFunction(int value) {
     if (value < 0) {
       print("negative");
     } else {
       print("positive");
@@ skipping 36 matching lines @@
   expect(stack['frames'].length, greaterThanOrEqualTo(2));
   expect(stack['frames'][0].function.name, equals('myFunction'));
   expect(stack['frames'][0].function.dartOwner.name, equals('MyClass'));
 
   var func = stack['frames'][0].function;
   expect(func.name, equals('myFunction'));
   await func.load();
 
   var expectedRange = {
     'scriptIndex': 0,
-    'startPos': 33,
-    'endPos': 82,
+    'startPos': 38,
+    'endPos': 87,
     'compiled': true,
-    'coverage': {'hits': [48, 66, 76], 'misses': [54]}
+    'coverage': {'hits': [53, 71, 81], 'misses': [59]}
   };
 
   // Full script
   var params = { 'reports' : ['Coverage'],
                  'scriptId' : func.location.script.id };
   var coverage = await isolate.invokeRpcNoUpgrade('_getSourceReport', params);
   expect(coverage['type'], equals('SourceReport'));
   expect(coverage['ranges'].length, 6);
   expect(coverage['ranges'][0], equals(expectedRange));
   expect(coverage['scripts'].length, 1);
@@ skipping 70 matching lines @@
     expect(e.message,
            "_getSourceReport: the 'endTokenPos' parameter requires the "
            "\'scriptId\' parameter");
   }
   expect(caughtException, isTrue);
 },
 
 ];
 
 main(args) => runIsolateTests(args, tests, testeeConcurrent: testFunction);