Use explicit workspace mutation requests for window sync

editor/app/Windowing/System/EditorWindowSystem.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "Composition/EditorWindowWorkspaceStore.h"
+#include "Windowing/Frame/EditorWindowTransferRequests.h"
 #include "Windowing/System/EditorWindowSynchronizationPlan.h"
 
 #include <XCEditor/Workspace/UIEditorWorkspaceController.h>
@@ -41,6 +42,11 @@ public:
         const std::vector<EditorWindowHostSnapshot>& hostWindows,
         std::wstring_view primaryWindowTitle,
         std::string& outError) const;
+    EditorWindowSynchronizationPlan BuildPlanForWorkspaceMutationRequest(
+        const EditorWindowWorkspaceMutationRequest& request,
+        const std::vector<EditorWindowHostSnapshot>& hostWindows,
+        std::wstring_view primaryWindowTitle,
+        std::string& outError) const;
     EditorWindowSynchronizationPlan BuildPlanForDestroyedWindow(
         std::string_view windowId,
         const std::vector<EditorWindowHostSnapshot>& hostWindows,