Add a new kind of suite to ease test.dart integration.

pkg/front_end/test/fasta/testing.json

 {
 "":"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.md file.",
+
   "packages": "../../../../.packages",
+
   "suites": [
+
     {
       "name": "scanner",
       "kind": "Chain",
       "source": "scanner/scanner_suite.dart",
       "path": "../../../../",
       "status": "scanner/scanner.status",
       "pattern": [
         "\\.dart$"
       ],
       "exclude": [
       ]
     },
+
     {
       "name": "parser",
       "kind": "Chain",
       "source": "parser/parser_suite.dart",
       "path": "../../../../",
       "status": "parser/parser.status",
       "pattern": [
         "\\.dart$"
       ],
       "exclude": [
         "README.dart",
         "/sdk/xcodebuild/",
         "/sdk/out/",
         "/sdk/build/",
         "/sdk/tools/sdks/",
         "/sdk/generated/"
       ]
     },
+
     {
       "name": "outline",
       "kind": "Chain",
       "source": "outline_test.dart",
       "path": "./",
       "status": "outline.status",
       "pattern": [
         "\\.dart$"
       ],
       "exclude": [
         "/test/.*_test\\.dart$",
         "/test/.*_suite\\.dart$"
       ]
     },
+
     {
       "name": "compile",
       "kind": "Chain",
       "source": "compile_test.dart",
       "path": "./",
       "status": "compile.status",
       "pattern": [
         "\\.dart$"
       ],
       "exclude": [
         "/test/.*_test\\.dart$",
         "/test/.*_suite\\.dart$"
       ]
     },
+
     {
       "name": "kompile",
       "kind": "Chain",
       "source": "kompile_test.dart",
       "path": "./",
       "status": "kompile.status",
       "pattern": [
         "\\.dart$"
       ],
       "exclude": [
         "/test/.*_test\\.dart$",
         "/test/.*_suite\\.dart$"
       ]
     },
+
     {
       "name": "language",
       "kind": "Chain",
       "source": "sdk_test.dart",
       "path": "../../../../tests/language/",
       "status": "language.status",
       "process-multitests": true,
       "pattern": [
         "_test\\.dart$"
       ],
       "": "deep_nesting{1,2}_negative_test are ignored because they cause a",
       "": "crash that we're ignoring for now (it was fixed in Rasta).",
       "": "The other tests are excluded because they try to use 'none' as ",
       "": "subtest name in multi test.",
       "": "Tracked by: https://github.com/dart-lang/sdk/issues/28436",
       "exclude": [
         "/sdk/tests/language/deep_nesting1_negative_test\\.dart$",
         "/sdk/tests/language/deep_nesting2_negative_test\\.dart$",
         "/sdk/tests/language/async_switch_test\\.dart$",
         "/sdk/tests/language/arg_param_trailing_comma_test\\.dart$",
         "/sdk/tests/language/assert_initializer_test\\.dart$",
         "/sdk/tests/language/deferred_type_dependency_test\\.dart$",
         "/sdk/tests/language/mixin_of_mixin_test\\.dart$",
         "/sdk/tests/language/regress_23996_test\\.dart$",
         "/sdk/tests/language/round_test\\.dart$"
       ]
+    },
+
+    {
+      "name": "dart2js",
+      "kind": "test_dart",
+      "arch": "x64",
+      "mode": "release",
+      "common": "--dart2js-batch --time -pcolor --report --failure-summary -ax64 -mrelease",
+      "command-lines": [
+        "--checked dart2js",
+        "-cdart2js -rd8 --exclude-suite=observatory_ui",
+        "-cdart2js -rd8 dart2js_extra dart2js_native"
+      ]
     }
   ],
 
   "analyze": {
+
     "uris": [
       "../../lib/src/fasta",
       "../../lib/src/fasta/analyzer",
       "../../lib/src/fasta/bin",
       "../../lib/src/fasta/builder",
       "../../lib/src/fasta/dill",
       "../../lib/src/fasta/kernel",
       "../../lib/src/fasta/parser",
       "../../lib/src/fasta/parser/bin",
       "../../lib/src/fasta/scanner",
       "../../lib/src/fasta/scanner/bin",
       "../../lib/src/fasta/scanner/testing",
       "../../lib/src/fasta/source",
       "../../lib/src/fasta/testing",
       "../../lib/src/fasta/util",
-      "dart2js_test.dart",
       "parser/parser_suite.dart",
       "scanner/scanner_suite.dart",
       "compile_test.dart",
-      "dart2js_test.dart",
       "kompile_test.dart",
       "outline_test.dart",
       "sdk_test.dart",
       "../../../../utils/kernel-service/kernel-service.dart"
     ],
+
     "exclude": [
       "/third_party/pkg/",
       "/pkg/analyzer/"
     ]
   }
 }