[ABANDONED] Call Microtask::performCheckpoint for each worker task.

Source/bindings/v8/WorkerScriptController.cpp

Index: Source/bindings/v8/WorkerScriptController.cpp
diff --git a/Source/bindings/v8/WorkerScriptController.cpp b/Source/bindings/v8/WorkerScriptController.cpp
index 947aa27d062537722080e3ab0931619a00f899db..8b5c32ec7b1949f1fe3eaaa1e4ba2c17d7568190 100644
--- a/Source/bindings/v8/WorkerScriptController.cpp
+++ b/Source/bindings/v8/WorkerScriptController.cpp
@@ -70,6 +70,16 @@ WorkerScriptController::WorkerScriptController(WorkerGlobalScope& workerGlobalSc
     V8PerIsolateData::ensureInitialized(m_isolate);
     m_world = DOMWrapperWorld::create(WorkerWorldId);
     m_interruptor = adoptPtr(new V8IsolateInterruptor(m_isolate));
+
+    // FIXME: Calling v8::Context::New in ensureDomInJsContext() later may
+    // fail in certain cases and lead to a crash.
+    // Since the main thread may call scheduleExecutionTermination at arbitrary
+    // timing, calling v8::Context::New in the worker thread may fail and
+    // result in a crash.
+    // We need these statements here to prevent that.
+    v8::HandleScope handleScope(m_isolate);
+    V8PerIsolateData::from(m_isolate)->ensureDomInJSContext();
+
     ThreadState::current()->addInterruptor(m_interruptor.get());
 }