Add 'self_check' runtime for running self-checking unit tests

tools/testing/dart/test_options.dart

Index: tools/testing/dart/test_options.dart
diff --git a/tools/testing/dart/test_options.dart b/tools/testing/dart/test_options.dart
index f84a5601688e88f58738040ff7428a7754d07570..89241626cc6765f51a8a6cc9cc9ec9dc9a8b262e 100644
--- a/tools/testing/dart/test_options.dart
+++ b/tools/testing/dart/test_options.dart
@@ -121,6 +121,11 @@ class TestOptionsParser {
     [ff | chrome | safari | ie9 | ie10 | ie11 | opera | chromeOnAndroid]:
         Run JavaScript in the specified browser.
 
+    self_check: Pass each test or its compiled output to every file under
+        `pkg` whose name ends with `_self_check.dart`.
+        Each test is given to the self_check tester as a filename on stdin using
+        the batch-mode protocol.
+
     none: No runtime, compile only (for example, used for dart2analyzer static
           analysis tests).''',
           ['-r', '--runtime'],
@@ -144,6 +149,7 @@ class TestOptionsParser {
             'safarimobilesim',
             'ContentShellOnAndroid',
             'DartiumOnAndroid',
+            'self_check',
             'none'
           ],
           'vm'),
@@ -479,6 +485,13 @@ Note: currently only implemented for dart2js.''',
           ['--exclude-suite'],
           defaultTestSelectors,
           null),
+      new _TestOptionSpecification(
+          'skip-compilation',
+          'Skip the compilation step, using the output from the previous run.',

[Bill Hesse, 2016/12/06 14:46:03]

I don't understand what "using the output from the previous run" means.  Please
write more.

[asgerf, 2016/12/06 15:41:49]

I've added some more text.

If this flag is a serious grief for you I can take out again. I just found it
useful.

+          ['--skip-compilation'],
+          [],
+          false,
+          type: 'bool')
     ];
   }
 
@@ -697,7 +710,7 @@ Note: currently only implemented for dart2js.''',
         break;
       case 'app_jit':
       case 'dartk':
-        validRuntimes = const ['vm'];
+        validRuntimes = const ['vm', 'self_check', 'none'];
         break;
       case 'precompiler':
       case 'dartkp':