Support PhantomJS.

lib/src/runner/browser/server.dart

Index: lib/src/runner/browser/server.dart
diff --git a/lib/src/runner/browser/server.dart b/lib/src/runner/browser/server.dart
index 67cead97be81560c4933e10d4fb0a827a70209e4..eacec516f7e273e5b1fbe3ea82429c6f393fdc8a 100644
--- a/lib/src/runner/browser/server.dart
+++ b/lib/src/runner/browser/server.dart
@@ -29,6 +29,7 @@ import 'chrome.dart';
 import 'dartium.dart';
 import 'content_shell.dart';
 import 'firefox.dart';
+import 'phantom_js.dart';
 
 /// A server that serves JS-compiled tests to browsers.
 ///
@@ -352,6 +353,7 @@ void main() {
       case TestPlatform.dartium: return new Dartium(url);
       case TestPlatform.contentShell: return new ContentShell(url);
       case TestPlatform.chrome: return new Chrome(url);
+      case TestPlatform.phantomJS: return new PhantomJS(url);
       case TestPlatform.firefox: return new Firefox(url);
       default:
         throw new ArgumentError("$browser is not a browser.");