Move annotated_code_helper.dart into front_end.

This avoids the need for the analyzer to depend on the unpublished
package sourcemap_testing.

Change-Id: I7632df2028d4f3557d2c5c4a3a75510cda968efd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/108268
Commit-Queue: Paul Berry <paulberry@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>

pkg/analyzer/test/util/id_equivalence_helper.dart

@@ -11,9 +11,9 @@
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/dart/analysis/utilities.dart';
 import 'package:analyzer/dart/ast/ast.dart' hide Annotation;
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 import 'package:front_end/src/testing/id.dart'
     show ActualData, Id, IdValue, MemberId, NodeId;
-import 'package:sourcemap_testing/src/annotated_code_helper.dart';
 
 /// Checks [compiledData] against the expected data in [expectedMap] derived
 /// from [code].

pkg/dev_compiler/test/sourcemap/common.dart

@@ -7,7 +7,7 @@ import 'dart:async' show Future;
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
-import 'package:sourcemap_testing/src/annotated_code_helper.dart';
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 import 'package:sourcemap_testing/src/stepping_helper.dart';
 import 'package:testing/testing.dart';
 

pkg/dev_compiler/test/sourcemap/ddc_common.dart

@@ -8,8 +8,8 @@ import 'dart:io';
 import 'dart:mirrors' show currentMirrorSystem;
 
 import 'package:front_end/src/api_unstable/ddc.dart' as fe;
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 import 'package:path/path.dart' as path;
-import 'package:sourcemap_testing/src/annotated_code_helper.dart';
 import 'package:sourcemap_testing/src/stacktrace_helper.dart';
 import 'package:sourcemap_testing/src/stepping_helper.dart';
 import 'package:testing/testing.dart';

pkg/sourcemap_testing/lib/src/stacktrace_helper.dart

@@ -7,13 +7,12 @@ import 'dart:io';
 import 'dart:convert' show jsonDecode;
 
 import 'package:expect/expect.dart';
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 import 'package:source_maps/source_maps.dart';
 import 'package:source_maps/src/utils.dart';
 import 'package:source_span/source_span.dart';
 import 'package:dart2js_tools/src/dart2js_mapping.dart';
 
-import 'annotated_code_helper.dart';
-
 const String INPUT_FILE_NAME = 'input.dart';
 
 class Test {

pkg/sourcemap_testing/lib/src/stepping_helper.dart

@@ -1,11 +1,10 @@
 import 'dart:io';
 
 import 'package:expect/minitest.dart';
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 import 'package:path/path.dart' as path;
 import 'package:source_maps/source_maps.dart';
 
-import 'annotated_code_helper.dart';
-
 /**
  * Runs D8 and steps as the AnnotatedCode dictates.
  *

pkg/sourcemap_testing/pubspec.yaml

@@ -8,3 +8,4 @@ environment:
 dependencies:
   package_config: '>=0.1.1 <2.0.0'
   pub_semver: ^1.2.1
+  front_end: ^0.1.20

tests/compiler/dart2js/equivalence/id_equivalence_helper.dart

@@ -14,7 +14,7 @@ import 'package:compiler/src/compiler.dart';
 import 'package:compiler/src/elements/entities.dart';
 import 'package:compiler/src/util/features.dart';
 import 'package:expect/expect.dart';
-import 'package:sourcemap_testing/src/annotated_code_helper.dart';
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 
 import '../helpers/memory_compiler.dart';
 import '../equivalence/id_equivalence.dart';

tests/compiler/dart2js/sourcemaps/mapping_test.dart

@@ -9,7 +9,7 @@ import 'package:async_helper/async_helper.dart';
 import 'package:compiler/compiler_new.dart';
 import 'package:expect/expect.dart';
 import 'package:source_maps/source_maps.dart';
-import 'package:sourcemap_testing/src/annotated_code_helper.dart';
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 
 import '../helpers/memory_compiler.dart';
 
@@ -72,7 +72,7 @@ void main(List<String> arguments) {
     } else if (arg == '--write-js') {
       writeJs = true;
     } else {
-      int index = int.parse(arg, onError: (_) => null);
+      int index = int.tryParse(arg);
       if (index != null) {
         indices ??= <int>[];
         if (index < 0 || index >= TESTS.length) {

tests/compiler/dart2js/sourcemaps/stepping_test.dart

@@ -11,7 +11,7 @@ import 'package:compiler/compiler_new.dart';
 import 'package:compiler/src/commandline_options.dart';
 import 'package:compiler/src/dart2js.dart' as entry;
 import 'package:expect/expect.dart';
-import 'package:sourcemap_testing/src/annotated_code_helper.dart';
+import 'package:front_end/src/testing/annotated_code_helper.dart';
 import 'package:sourcemap_testing/src/stepping_helper.dart';
 
 void main(List<String> args) {