Fix GPU Tasks queue to be executed on frame start, rather than end

Source/Engine/Graphics/Async/DefaultGPUTasksExecutor.cpp

@@ -23,19 +23,18 @@ void DefaultGPUTasksExecutor::FrameBegin()
         _context = createContext();
 
     _context->OnFrameBegin();
-}
 
-void DefaultGPUTasksExecutor::FrameEnd()
-{
-    ASSERT(_context != nullptr);
-
-    // Default implementation performs async operations on end of the frame which is synchronized with a rendering thread
+    // Default implementation performs async operations on start of the frame which is synchronized with a rendering thread
     GPUTask* buffer[32];
     const int32 count = GPUDevice::Instance->GetTasksManager()->RequestWork(buffer, 32);
     for (int32 i = 0; i < count; i++)
     {
         _context->Run(buffer[i]);
     }
+}
 
+void DefaultGPUTasksExecutor::FrameEnd()
+{
+    ASSERT(_context != nullptr);
     _context->OnFrameEnd();
 }