[worklets] Introduce ThreadedWorkletMessagingProxy and AnimationWorkletMessagaingProxy.

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

Index: third_party/WebKit/Source/core/workers/ThreadedWorkletGlobalScopeProxy.h
diff --git a/third_party/WebKit/Source/core/workers/ThreadedWorkletGlobalScopeProxy.h b/third_party/WebKit/Source/core/workers/ThreadedWorkletGlobalScopeProxy.h
index b3c82b24fb894654ce9af64f8274ff8b14b3fba0..3e1c6838fe6939a5710cdc9f7245da58af640d56 100644
--- a/third_party/WebKit/Source/core/workers/ThreadedWorkletGlobalScopeProxy.h
+++ b/third_party/WebKit/Source/core/workers/ThreadedWorkletGlobalScopeProxy.h
@@ -7,19 +7,15 @@
 
 #include "core/workers/WorkletGlobalScopeProxy.h"
 
+// TODO(ikilpatrick): remove this file once AudioWorklet is no longer using it.
+
 namespace blink {
 
 class ThreadedWorkletGlobalScopeProxy : public WorkletGlobalScopeProxy {
 public:
-    void evaluateScript(const ScriptSourceCode&) final
-    {
-        // TODO(ikilpatrick): implement.
-    }
-
-    void terminateWorkletGlobalScope() final
-    {
-        // TODO(ikilpatrick): implement.
-    }
+    void evaluateScript(const ScriptSourceCode&) final {}
+
+    void terminateWorkletGlobalScope() final {}
 };
 
 } // namespace blink