Add browser tags to all of our tests.

test/runner/test_on_test.dart

 // Copyright (c) 2015, 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.
 
 @TestOn("vm")
 
 import 'dart:io';
 
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_stream.dart';
@@ skipping 15 matching lines @@
       test.stdout.expect(consumeThrough(contains("All tests passed!")));
       test.shouldExit(0);
     });
 
     test("doesn't run a test suite on a non-matching platform", () {
       _writeTestFile("vm_test.dart", suiteTestOn: "vm");
 
       var test = runTest(["--platform", "content-shell", "vm_test.dart"]);
       test.stdout.expect(consumeThrough(contains("No tests ran.")));
       test.shouldExit(0);
-    });
+    }, tags: 'content-shell');
 
     test("runs a test suite on a matching operating system", () {
       _writeTestFile("os_test.dart", suiteTestOn: currentOS.name);
 
       var test = runTest(["os_test.dart"]);
       test.stdout.expect(consumeThrough(contains("All tests passed!")));
       test.shouldExit(0);
     });
 
     test("doesn't run a test suite on a non-matching operating system", () {
@@ skipping 36 matching lines @@
       test.shouldExit(0);
     });
 
     test("runs a browser group on a browser", () {
       _writeTestFile("browser_test.dart", groupTestOn: "browser");
 
       var test = runTest(
           ["--platform", "content-shell", "browser_test.dart"]);
       test.stdout.expect(consumeThrough(contains("All tests passed!")));
       test.shouldExit(0);
-    });
+    }, tags: 'content-shell');
 
     test("doesn't run a VM group on a browser", () {
       _writeTestFile("vm_test.dart", groupTestOn: "vm");
 
       var test = runTest(["--platform", "content-shell", "vm_test.dart"]);
       test.stdout.expect(consumeThrough(contains("No tests ran.")));
       test.shouldExit(0);
-    });
+    }, tags: 'content-shell');
   });
 
   group("for test", () {
     test("runs a VM test on the VM", () {
       _writeTestFile("vm_test.dart", testTestOn: "vm");
 
       var test = runTest(["vm_test.dart"]);
       test.stdout.expect(consumeThrough(contains("All tests passed!")));
       test.shouldExit(0);
     });
 
     test("doesn't run a browser test on the VM", () {
       _writeTestFile("browser_test.dart", testTestOn: "browser");
 
       var test = runTest(["browser_test.dart"]);
       test.stdout.expect(consumeThrough(contains("No tests ran.")));
       test.shouldExit(0);
     });
 
     test("runs a browser test on a browser", () {
       _writeTestFile("browser_test.dart", testTestOn: "browser");
 
       var test = runTest(
           ["--platform", "content-shell", "browser_test.dart"]);
       test.stdout.expect(consumeThrough(contains("All tests passed!")));
       test.shouldExit(0);
-    });
+    }, tags: 'content-shell');
 
     test("doesn't run a VM test on a browser", () {
       _writeTestFile("vm_test.dart", testTestOn: "vm");
 
       var test = runTest(["--platform", "content-shell", "vm_test.dart"]);
       test.stdout.expect(consumeThrough(contains("No tests ran.")));
       test.shouldExit(0);
-    });
+    }, tags: 'content-shell');
   });
 
   group("with suite, group, and test selectors", () {
     test("runs the test if all selectors match", () {
       _writeTestFile("vm_test.dart", suiteTestOn: "!browser",
           groupTestOn: "!js", testTestOn: "vm");
 
       var test = runTest(["vm_test.dart"]);
       test.stdout.expect(consumeThrough(contains("All tests passed!")));
       test.shouldExit(0);
@@ skipping 53 matching lines @@
   if (groupTestOn != null) {
     buffer.writeln("  }, testOn: '$groupTestOn');");
   } else {
     buffer.writeln("  });");
   }
 
   buffer.writeln("}");
 
   d.file(filename, buffer.toString()).create();
 }