Add --dart-flags and --disable-dart command line switches.

webkit/glue/webkit_glue.cc

Index: webkit/glue/webkit_glue.cc
diff --git a/webkit/glue/webkit_glue.cc b/webkit/glue/webkit_glue.cc
index cf4f4526629688d7b531fb32e5666e418221efcd..e16b6177f0b143b20970471f8cb8653410a91ca1 100644
--- a/webkit/glue/webkit_glue.cc
+++ b/webkit/glue/webkit_glue.cc
@@ -85,6 +85,12 @@ void SetJavaScriptFlags(const std::string& str) {
 #endif
 }
 
+void SetDartFlags(const std::string& str) {
+#if WEBKIT_USING_DART
+  WebKit::setDartFlags(str.data(), static_cast<int>(str.size()));
+#endif
+}
+
 void EnableWebCoreLogChannels(const std::string& channels) {
   if (channels.empty())
     return;