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

Source/bindings/v8/WorkerScriptController.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 52 matching lines @@
     , m_workerGlobalScope(workerGlobalScope)
     , m_executionForbidden(false)
     , m_executionScheduledToTerminate(false)
 {
     m_isolate->Enter();
     V8Initializer::initializeWorker(m_isolate);
     v8::V8::Initialize();
     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

[adamk, 2014/03/31 15:27:37]

What circumstances?  What do the crashes look like?

+    // fail in certain cases and lead to 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());
 }
 
 // We need to postpone V8 Isolate destruction until the very end of
 // worker thread finalization when all objects on the worker heap
 // are destroyed.
 class IsolateCleanupTask : public ThreadState::CleanupTask {
 public:
     static PassOwnPtr<IsolateCleanupTask> create(v8::Isolate* isolate)
     {
@@ skipping 174 matching lines @@
     m_disableEvalPending = errorMessage;
 }
 
 void WorkerScriptController::rethrowExceptionFromImportedScript(PassRefPtr<ErrorEvent> errorEvent)
 {
     m_errorEventFromImportedScript = errorEvent;
     throwError(V8ThrowException::createError(v8GeneralError, m_errorEventFromImportedScript->message(), m_isolate), m_isolate);
 }
 
 } // namespace WebCore