bug fix

engine/src/shell/platform/unity/darwin/macos/unity_surface_manager.mm

     }
   }
 
-  FML_DCHECK(gl_context_ != nullptr);
+  FML_DCHECK(gl_context_ != nullptr && gl_resource_context_ != nullptr);
 }
 
 UnitySurfaceManager::~UnitySurfaceManager() { ReleaseNativeRenderContext(); }
 
 bool UnitySurfaceManager::MakeCurrentResourceContext()
 {
-  if (gl_resource_context_ == nullptr)
-  {
-      [gl_context_ makeCurrentContext];
-  }
-  else
-  {
-      [gl_resource_context_ makeCurrentContext];
-  }
+  [gl_resource_context_ makeCurrentContext];
   return true;
 }
 
 
 void UnitySurfaceManager::ReleaseNativeRenderContext()
 {
-  if (gl_resource_context_ != nullptr)
-  {
-      CGLReleaseContext(gl_resource_context_.CGLContextObj);
-      gl_resource_context_ = nullptr;
-  }
+  FML_DCHECK(gl_resource_context_);
+  CGLReleaseContext(gl_resource_context_.CGLContextObj);
+  gl_resource_context_ = nullptr;
 
   FML_DCHECK(gl_context_);
   CGLReleaseContext(gl_context_.CGLContextObj);

engine/src/shell/platform/unity/windows/uiwidgets_system.cc

 void UIWidgetsSystem::GfxWorkerCallback(int eventId, void* data) {
   const fml::closure task(std::move(gfx_worker_tasks_[eventId]));
   {
-    std::scoped_lock(task_mutex_);
+    std::scoped_lock lock(task_mutex_);
     gfx_worker_tasks_.erase(eventId);
   }
   task();
 
   {
-    std::scoped_lock(task_mutex_);
+    std::scoped_lock lock(task_mutex_);
     last_task_id_++;
     gfx_worker_tasks_[last_task_id_] = task;
   }