[proof-of-concept] SW thread independent of the main thread

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

Index: third_party/WebKit/Source/core/workers/WorkerReportingProxy.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerReportingProxy.h b/third_party/WebKit/Source/core/workers/WorkerReportingProxy.h
index 166163e6203501fdebb3abb2525a215b179c0d6e..139877827b453be57b567265a99738b8114bae84 100644
--- a/third_party/WebKit/Source/core/workers/WorkerReportingProxy.h
+++ b/third_party/WebKit/Source/core/workers/WorkerReportingProxy.h
@@ -40,6 +40,7 @@
 namespace blink {
 
 class ConsoleMessage;
+class KURL;
 class SourceLocation;
 class WorkerOrWorkletGlobalScope;
 
@@ -74,6 +75,10 @@ public:
     // is to be destructed. (When this is called it is guaranteed that
     // WorkerGlobalScope is still alive)
     virtual void willDestroyWorkerGlobalScope() = 0;
+
+    virtual void initializeOnWorkerThread() {}
+
+    virtual std::unique_ptr<String> takeAlternativeCode(const KURL&) { return nullptr; }
 };
 
 } // namespace blink