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

pkg/front_end/test/fasta/testing.json

Index: pkg/front_end/test/fasta/testing.json
diff --git a/pkg/front_end/test/fasta/testing.json b/pkg/front_end/test/fasta/testing.json
index 29c7ab71a38d97d7c41503f3939e86e63a78f8d2..973a9c0b9f8abc05999d586583a4edd4c5ffe17f 100644
--- a/pkg/front_end/test/fasta/testing.json
+++ b/pkg/front_end/test/fasta/testing.json
@@ -2,8 +2,11 @@
 "":"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",
@@ -16,6 +19,7 @@
       "exclude": [
       ]
     },
+
     {
       "name": "parser",
       "kind": "Chain",
@@ -34,6 +38,7 @@
         "/sdk/generated/"
       ]
     },
+
     {
       "name": "outline",
       "kind": "Chain",
@@ -48,6 +53,7 @@
         "/test/.*_suite\\.dart$"
       ]
     },
+
     {
       "name": "compile",
       "kind": "Chain",
@@ -62,6 +68,7 @@
         "/test/.*_suite\\.dart$"
       ]
     },
+
     {
       "name": "kompile",
       "kind": "Chain",
@@ -76,6 +83,7 @@
         "/test/.*_suite\\.dart$"
       ]
     },
+
     {
       "name": "language",
       "kind": "Chain",
@@ -102,10 +110,24 @@
         "/sdk/tests/language/regress_23996_test\\.dart$",
         "/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",
@@ -121,16 +143,15 @@
       "../../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/"