[worklets] Make WorkerThread handle both Worker and Worklet global scopes.

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

Index: third_party/WebKit/Source/core/workers/WorkerOrWorkletGlobalScope.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerOrWorkletGlobalScope.h b/third_party/WebKit/Source/core/workers/WorkerOrWorkletGlobalScope.h
index 0127a065141280b0587431d5274464925a8153ee..c0f7ed63862e08ff08bf960d2ba5460074016927 100644
--- a/third_party/WebKit/Source/core/workers/WorkerOrWorkletGlobalScope.h
+++ b/third_party/WebKit/Source/core/workers/WorkerOrWorkletGlobalScope.h
@@ -16,6 +16,16 @@ class CORE_EXPORT WorkerOrWorkletGlobalScope : public ExecutionContext {
 public:
     virtual ScriptWrappable* getScriptWrappable() const = 0;
     virtual WorkerOrWorkletScriptController* scriptController() = 0;
+
+    // Returns true when the WorkerOrWorkletGlobalScope is closing (e.g. via
+    // WorkerGlobalScope#close() method). If this returns true, the worker is
+    // going to be shutdown after the current task execution. Globals that
+    // don't support close operation should always return false.
+    virtual bool isClosing() const = 0;
+
+    // Should be called before destroying the global scope object. Allows
+    // sub-classes to perform any cleanup needed.
+    virtual void dispose() = 0;
 };
 
 DEFINE_TYPE_CASTS(WorkerOrWorkletGlobalScope, ExecutionContext, context, (context->isWorkerGlobalScope() || context->isWorkletGlobalScope()), (context.isWorkerGlobalScope() || context.isWorkletGlobalScope()));