Update Dart dependency and patch dart_controller to account for

sky/engine/core/script/dart_controller.cc

Index: sky/engine/core/script/dart_controller.cc
diff --git a/sky/engine/core/script/dart_controller.cc b/sky/engine/core/script/dart_controller.cc
index 04b03c117f329dbea5da92a91cdc32868e24a421..18e5532ba064734c73f83ebc05c4f58a3a4f5d78 100644
--- a/sky/engine/core/script/dart_controller.cc
+++ b/sky/engine/core/script/dart_controller.cc
@@ -238,6 +238,7 @@ static void EnsureHandleWatcherStarted() {
 static Dart_Isolate IsolateCreateCallback(const char* script_uri,
                                           const char* main,
                                           const char* package_root,
+                                          Dart_IsolateFlags* flags,
                                           void* callback_data,
                                           char** error) {
 
@@ -248,6 +249,7 @@ static Dart_Isolate IsolateCreateCallback(const char* script_uri,
                                               "main",
                                               kDartIsolateSnapshotBuffer,
                                               nullptr,
+                                              nullptr,
                                               error);
     CHECK(isolate) << error;
     dart_state->SetIsolate(isolate);
@@ -278,7 +280,7 @@ static Dart_Isolate IsolateCreateCallback(const char* script_uri,
   CHECK(kDartIsolateSnapshotBuffer);
   DartState* dart_state = new DartState();
   Dart_Isolate isolate = Dart_CreateIsolate("sky:handle_watcher", "",
-      kDartIsolateSnapshotBuffer, dart_state, error);
+      kDartIsolateSnapshotBuffer, nullptr, dart_state, error);
   CHECK(isolate) << error;
   dart_state->SetIsolate(isolate);
 
@@ -324,7 +326,7 @@ void DartController::CreateIsolateFor(PassOwnPtr<DOMDartState> state) {
   dom_dart_state_ = state;
   Dart_Isolate isolate = Dart_CreateIsolate(
       dom_dart_state_->url().string().utf8().data(), "main",
-      kDartIsolateSnapshotBuffer,
+      kDartIsolateSnapshotBuffer, nullptr,
       static_cast<DartState*>(dom_dart_state_.get()), &error);
   Dart_SetMessageNotifyCallback(MessageNotifyCallback);
   CHECK(isolate) << error;