Add content shell support.

test/runner/browser/runner_test.dart

Index: test/runner/browser/runner_test.dart
diff --git a/test/runner/browser/runner_test.dart b/test/runner/browser/runner_test.dart
index e8573b8afa48c100d686200149aa835e4d969a2a..e2c4072f2aa8b0c3fb62ecb20291ca834e98fc2c 100644
--- a/test/runner/browser/runner_test.dart
+++ b/test/runner/browser/runner_test.dart
@@ -139,6 +139,13 @@ void main() {
       expect(result.exitCode, equals(0));
     });
 
+    test("on content shell", () {
+      new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_success);
+      var result = _runUnittest(["-p", "content-shell", "test.dart"]);
+      expect(result.stdout, isNot(contains("Compiling")));
+      expect(result.exitCode, equals(0));
+    });
+
     test("on multiple browsers", () {
       new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_success);
       var result = _runUnittest(["-p", "firefox", "-p", "chrome", "test.dart"]);
@@ -148,7 +155,8 @@ void main() {
 
     test("on a JS and non-JS browser", () {
       new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_success);
-      var result = _runUnittest(["-p", "dartium", "-p", "chrome", "test.dart"]);
+      var result = _runUnittest(
+          ["-p", "content-shell", "-p", "chrome", "test.dart"]);
       expect("Compiling".allMatches(result.stdout), hasLength(1));
       expect(result.exitCode, equals(0));
     });
@@ -179,6 +187,12 @@ void main() {
       expect(result.exitCode, equals(1));
     });
 
+    test("on content-shell", () {
+      new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_failure);
+      var result = _runUnittest(["-p", "content-shell", "test.dart"]);
+      expect(result.exitCode, equals(1));
+    });
+
     test("that fail only on the browser", () {
       new File(p.join(_sandbox, "test.dart")).writeAsStringSync("""
 import 'dart:async';