Add support for --dart2js-path and --dart2js-args.

lib/src/runner/browser/platform.dart

Index: lib/src/runner/browser/platform.dart
diff --git a/lib/src/runner/browser/platform.dart b/lib/src/runner/browser/platform.dart
index 057668543a2d3883151af9727408f8c2d24fd713..2884a530cb9c4d48b5cf2d0c4fc1b32cf90efb93 100644
--- a/lib/src/runner/browser/platform.dart
+++ b/lib/src/runner/browser/platform.dart
@@ -114,7 +114,7 @@ class BrowserPlatform extends PlatformPlugin {
         _config = config,
         _compiledDir = config.pubServeUrl == null ? createTempDir() : null,
         _http = config.pubServeUrl == null ? null : new HttpClient(),
-        _compilers = new CompilerPool(color: config.color) {
+        _compilers = new CompilerPool(config) {
     var cascade = new shelf.Cascade()
         .add(_webSocketHandler.handler);