Update Dart dependency and patch dart_controller to account for non-backwards compatible API update

mojo/dart/embedder/dart_controller.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/sys_info.h"
 #include "crypto/random.h"
@@ skipping 242 matching lines @@
     const std::string& script_uri,
     const std::string& package_root,
     char** error) {
   IsolateData* isolate_data = new IsolateData(
       dart_app,
       strict_compilation,
       callbacks,
       script,
       script_uri,
       package_root);
-  Dart_Isolate isolate = Dart_CreateIsolate(
-      script_uri.c_str(), "main", isolate_snapshot_buffer, isolate_data, error);
+  Dart_Isolate isolate =
+      Dart_CreateIsolate(script_uri.c_str(), "main", isolate_snapshot_buffer,
+                         nullptr, isolate_data, error);
   if (isolate == nullptr) {
     delete isolate_data;
     return nullptr;
   }
 
   Dart_EnterScope();
 
   Dart_IsolateSetStrictCompilation(strict_compilation);
 
   // Set up the library tag handler for this isolate.
@@ skipping 70 matching lines @@
     Dart_ShutdownIsolate();
     return nullptr;
   }
 
   return isolate;
 }
 
 Dart_Isolate DartController::IsolateCreateCallback(const char* script_uri,
                                                    const char* main,
                                                    const char* package_root,
+                                                   Dart_IsolateFlags* flags,
                                                    void* callback_data,
                                                    char** error) {
   IsolateData* parent_isolate_data =
       reinterpret_cast<IsolateData*>(callback_data);
   std::string script_uri_string;
   std::string package_root_string;
 
   if (script_uri == nullptr) {
     if (callback_data == nullptr) {
       *error = strdup("Invalid 'callback_data' - Unable to spawn new isolate");
@@ skipping 385 matching lines @@
 
 void DartController::Shutdown() {
   StopHandleWatcherIsolate();
   Dart_Cleanup();
   service_isolate_running_ = false;
   initialized_ = false;
 }
 
 }  // namespace apps
 }  // namespace mojo