[Worklets] Add basic debugging to main thread worklets.

third_party/WebKit/Source/bindings/core/v8/WorkerOrWorkletScriptController.cpp

Index: third_party/WebKit/Source/bindings/core/v8/WorkerOrWorkletScriptController.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/WorkerOrWorkletScriptController.cpp b/third_party/WebKit/Source/bindings/core/v8/WorkerOrWorkletScriptController.cpp
index e0e0c22926d3ec4e2c66adee1f2214f7b689a18d..5e4d01f1e997ac1f49ef808f9c2573227a449b93 100644
--- a/third_party/WebKit/Source/bindings/core/v8/WorkerOrWorkletScriptController.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/WorkerOrWorkletScriptController.cpp
@@ -43,7 +43,9 @@
 #include "bindings/core/v8/WrapperTypeInfo.h"
 #include "core/events/ErrorEvent.h"
 #include "core/frame/DOMTimer.h"
+#include "core/inspector/MainThreadDebugger.h"
 #include "core/inspector/WorkerThreadDebugger.h"
+#include "core/workers/MainThreadWorkletGlobalScope.h"
 #include "core/workers/WorkerObjectProxy.h"
 #include "core/workers/WorkerOrWorkletGlobalScope.h"
 #include "core/workers/WorkerThread.h"
@@ -148,8 +150,11 @@ bool WorkerOrWorkletScriptController::initializeContextIfNeeded()
 
     ScriptState::Scope scope(m_scriptState.get());
 
-    // Name new context for debugging.
-    WorkerThreadDebugger::setContextDebugData(context);
+    // Name new context for debugging. For main thread worklet global scopes
+    // this is done once the context is initialized.
+    if (m_globalScope->isWorkerGlobalScope()) {
+        WorkerThreadDebugger::setContextDebugData(context);
+    }
 
     // Create a new JS object and use it as the prototype for the shadow global object.
     const WrapperTypeInfo* wrapperTypeInfo = m_globalScope->getScriptWrappable()->wrapperTypeInfo();