[DONT COMMIT] Worklet: Implement "addModule()" algorithm for main thread worklets

third_party/WebKit/Source/core/workers/ThreadedWorklet.h

Index: third_party/WebKit/Source/core/workers/ThreadedWorklet.h
diff --git a/third_party/WebKit/Source/core/workers/ThreadedWorklet.h b/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
index bb418d1ba039784b3c7feb310c1bdbbc179e78fe..9dc642145d8f7a9b4b21c47930fc9631d650aa3d 100644
--- a/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
+++ b/third_party/WebKit/Source/core/workers/ThreadedWorklet.h
@@ -15,6 +15,7 @@
 namespace blink {
 
 class LocalFrame;
+class WorkletGlobalScopeProxy;
 
 // A ThreadedWorklet is a worklet that runs off the main thread.
 // TODO(nhiroki): This is a temporary class to keep classic script loading for
@@ -39,6 +40,9 @@ class CORE_EXPORT ThreadedWorklet : public Worklet,
   // ContextLifecycleObserver
   void ContextDestroyed(ExecutionContext*) final;
 
+  // Returns a proxy to WorkletGlobalScope on the context thread.
+  virtual WorkletGlobalScopeProxy* GetWorkletGlobalScopeProxy() const = 0;
+
   DECLARE_VIRTUAL_TRACE();
 
  protected: