[Worker] Call prepareForShutdown ASAP when terminated forcibly

third_party/WebKit/Source/core/workers/WorkerThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerThread.cpp b/third_party/WebKit/Source/core/workers/WorkerThread.cpp
index 545efcef7cff5891a8665a58356f24684504ed8b..f91807ed230e21a4e46fd0ffa8c231cc2524234a 100644
--- a/third_party/WebKit/Source/core/workers/WorkerThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerThread.cpp
@@ -128,7 +128,8 @@ public:
     {
         Microtask::performCheckpoint(m_workerThread->isolate());
         if (WorkerOrWorkletGlobalScope* global = m_workerThread->globalScope()) {
-            if (WorkerOrWorkletScriptController* scriptController = global->scriptController())
+            WorkerOrWorkletScriptController* scriptController = global->scriptController();
+            if (scriptController)
                 scriptController->getRejectedPromises()->processQueue();
             if (global->isClosing()) {
                 // |m_workerThread| will eventually be requested to terminate.
@@ -136,6 +137,11 @@ public:
 
                 // Stop further worker tasks to run after this point.
                 m_workerThread->prepareForShutdownOnWorkerThread();
+            } else if (scriptController && scriptController->isExecutionTerminating()) {
+                // The script has been terminated forcibly, which means we need
+                // to ask objects in the thread to stop working as soon as
+                // possible.
+                m_workerThread->prepareForShutdownOnWorkerThread();
             }
         }
     }