Worker: Introduce an observation mechanism for WorkerThread termination

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

Index: third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h
diff --git a/third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h b/third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h
new file mode 100644
index 0000000000000000000000000000000000000000..cedea52e70701ba9cbf2642aea6842982db6dae7
--- /dev/null
+++ b/third_party/WebKit/Source/core/workers/WorkerThreadLifecycleObserver.h
@@ -0,0 +1,25 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WorkerThreadLifecycleObserver_h
+#define WorkerThreadLifecycleObserver_h
+
+#include "core/CoreExport.h"
+#include "platform/LifecycleObserver.h"
+
+namespace blink {
+
+class WorkerThread;
+class WorkerThreadContext;
+
+class CORE_EXPORT WorkerThreadLifecycleObserver : public LifecycleObserver<WorkerThreadContext, WorkerThreadLifecycleObserver> {

[yhirano, 2016/06/03 07:40:36]

+comments

[nhiroki, 2016/06/08 09:17:45]

Done.

+protected:
+    WorkerThreadLifecycleObserver(WorkerThread*);
+
+    bool isWorkerThreadTerminated() const;

[yhirano, 2016/06/03 07:40:36]

+comments

[yhirano, 2016/06/03 07:40:37]

On the design discussion at
https://docs.google.com/document/d/1rYFKem6SwghdISe_to5b4apORIKqjOpsV5FkE3f5W...,
there were negative feedback for "polling" function. See comments started by
Sami on the doc.

[nhiroki, 2016/06/08 09:17:45]

Oh, I missed that comment. Tweaked this function.

[nhiroki, 2016/06/08 09:17:45]

Done.

+};
+
+} // namespace blink
+
+#endif // WorkerThreadLifecycleObserver_h