Get the OpenGLUI emulator building again on the desktop. Mostly this is applying the changes here:

runtime/embedders/openglui/common/vm_glue.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef EMBEDDERS_OPENGLUI_COMMON_VM_GLUE_H_
 #define EMBEDDERS_OPENGLUI_COMMON_VM_GLUE_H_
 
 #include <stdlib.h>
 
 #include "embedders/openglui/common/events.h"
@@ skipping 32 matching lines @@
   }
 
   void FinishMainIsolate();
 
  private:
   int Invoke(const char *function, int argc, Dart_Handle* args,
              bool failIfNotDefined = true);
 
   static Dart_Handle CheckError(Dart_Handle);
 
-  static bool CreateIsolateAndSetupHelper(const char* script_uri,
+  static Dart_Isolate CreateIsolateAndSetupHelper(const char* script_uri,
                                           const char* main,
                                           void* data,
                                           char** error);
-  static bool CreateIsolateAndSetup(const char* script_uri,
+  static Dart_Isolate CreateIsolateAndSetup(const char* script_uri,
                                     const char* main,
                                     void* data, char** error);
   static Dart_Handle LibraryTagHandler(Dart_LibraryTag tag,
                                        Dart_Handle library,
                                        Dart_Handle urlHandle);
   static Dart_Handle LoadSourceFromFile(const char* url);
   static void ShutdownIsolate(void* callback_data);
 
   static bool initialized_vm_;
   static char* extension_script_;
   ISized* surface_;
   Dart_Isolate isolate_;
   bool initialized_script_;
   char* main_script_;
   float x_, y_, z_;  // Last values from accelerometer.
   bool accelerometer_changed_;
   int setup_flag_;
 };
 
 #endif  // EMBEDDERS_OPENGLUI_COMMON_VM_GLUE_H_