Worklet: Enable module script loading for main thread worklets

third_party/WebKit/Source/core/dom/Modulator.cpp

Index: third_party/WebKit/Source/core/dom/Modulator.cpp
diff --git a/third_party/WebKit/Source/core/dom/Modulator.cpp b/third_party/WebKit/Source/core/dom/Modulator.cpp
index 7d7f0ce0a7102fac9aef0a1ebf339216d18fdbc2..b17b720e4adf4413ae0a506dac906dde3b19f040 100644
--- a/third_party/WebKit/Source/core/dom/Modulator.cpp
+++ b/third_party/WebKit/Source/core/dom/Modulator.cpp
@@ -10,6 +10,7 @@
 #include "core/dom/Document.h"
 #include "core/dom/ModulatorImpl.h"
 #include "core/frame/LocalFrame.h"
+#include "core/workers/MainThreadWorkletGlobalScope.h"
 
 namespace blink {
 
@@ -27,11 +28,23 @@ Modulator* Modulator::From(ScriptState* script_state) {
 
   Modulator* modulator =
       static_cast<Modulator*>(per_context_data->GetData(kPerContextDataKey));
-  if (!modulator) {
-    if (Document* document = ToDocument(ExecutionContext::From(script_state))) {
-      modulator = ModulatorImpl::Create(script_state, *document);
-      Modulator::SetModulator(script_state, modulator);
-    }
+  if (modulator)
+    return modulator;
+  ExecutionContext* execution_context = ExecutionContext::From(script_state);
+  if (execution_context->IsDocument()) {
+    Document* document = ToDocument(execution_context);
+    modulator =
+        ModulatorImpl::Create(script_state, *document, document->Fetcher());
+    Modulator::SetModulator(script_state, modulator);
+  } else if (execution_context->IsMainThreadWorkletGlobalScope()) {
+    MainThreadWorkletGlobalScope* global_scope =
+        ToMainThreadWorkletGlobalScope(execution_context);
+    modulator = ModulatorImpl::Create(
+        script_state, *global_scope,
+        global_scope->GetFrame()->GetDocument()->Fetcher());
+    Modulator::SetModulator(script_state, modulator);
+  } else {
+    NOTREACHED();
   }
   return modulator;
 }