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

runtime/embedders/openglui/common/vm_glue.cc

 // 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.
 
 #include <math.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/stat.h>
@@ skipping 71 matching lines @@
         VMGlue::LoadSourceFromFile(extension_script_);
     Dart_Handle library = CheckError(Dart_LoadLibrary(urlHandle, source));
     CheckError(Dart_SetNativeResolver(library, ResolveName));
     return library;
   }
   LOGE("UNIMPLEMENTED: load library %s\n", url);
   return NULL;
 }
 
 // Returns true on success, false on failure.
-bool VMGlue::CreateIsolateAndSetupHelper(const char* script_uri,
+Dart_Isolate VMGlue::CreateIsolateAndSetupHelper(const char* script_uri,
                                          const char* main,
                                          void* data,
                                          char** error) {
   LOGI("Creating isolate %s, %s", script_uri, main);
   Dart_Isolate isolate =
       Dart_CreateIsolate(script_uri, main, NULL, data, error);
   if (isolate == NULL) {
     LOGE("Couldn't create isolate: %s", *error);
-    return false;
+    return NULL;
   }
 
   LOGI("Entering scope");
   Dart_EnterScope();
 
   // Set up the library tag handler for this isolate.
   LOGI("Setting up library tag handler");
   Dart_Handle result = CheckError(Dart_SetLibraryTagHandler(LibraryTagHandler));
   CHECK_RESULT(result);
 
   Dart_ExitScope();
-  return true;
+  return isolate;
 }
 
-bool VMGlue::CreateIsolateAndSetup(const char* script_uri,
+Dart_Isolate VMGlue::CreateIsolateAndSetup(const char* script_uri,
   const char* main,
   void* data, char** error) {
   return CreateIsolateAndSetupHelper(script_uri,
                                      main,
                                      data,
                                      error);
 }
 
 const char* VM_FLAGS[] = {
   "--enable_type_checks",  // TODO(gram): This should be an option!
@@ skipping 230 matching lines @@
 
 void VMGlue::FinishMainIsolate() {
   LOGI("Finish main isolate");
   Dart_EnterIsolate(isolate_);
   // Shutdown the isolate.
   Dart_ShutdownIsolate();
   isolate_ = NULL;
   initialized_script_ = false;
 }