Initial implementation of bindings and basic classes for worklets.

third_party/WebKit/Source/core/dom/ExecutionContext.h

Index: third_party/WebKit/Source/core/dom/ExecutionContext.h
diff --git a/third_party/WebKit/Source/core/dom/ExecutionContext.h b/third_party/WebKit/Source/core/dom/ExecutionContext.h
index 6f14afe041601b8c71259b2919881dd003b9e9c1..b2608961e12073e6a66b43b0b18d6cbc5fe9c8e5 100644
--- a/third_party/WebKit/Source/core/dom/ExecutionContext.h
+++ b/third_party/WebKit/Source/core/dom/ExecutionContext.h
@@ -72,7 +72,9 @@ public:
     };
 
     virtual bool isDocument() const { return false; }
+    virtual bool isAbstractGlobalScope() const { return false; }
     virtual bool isWorkerGlobalScope() const { return false; }
+    virtual bool isWorkletGlobalScope() const { return false; }
     virtual bool isDedicatedWorkerGlobalScope() const { return false; }
     virtual bool isSharedWorkerGlobalScope() const { return false; }
     virtual bool isServiceWorkerGlobalScope() const { return false; }