d8: Fix some TSAN bugs

src/d8.h

Index: src/d8.h
diff --git a/src/d8.h b/src/d8.h
index 4d723473ea385c2c66b65c6ee65fd40e872592b8..f3b8eee783f87a92912735dc567df15621300146 100644
--- a/src/d8.h
+++ b/src/d8.h
@@ -243,6 +243,7 @@ class Worker {
   void PostMessage(SerializationData* data);
   SerializationData* GetMessage();
   void Terminate();
+  void WaitForThread();
 
  private:
   class WorkerThread : public base::Thread {
@@ -257,7 +258,7 @@ class Worker {
     Worker* worker_;
   };
 
-  enum State { IDLE, RUNNING, TERMINATED };
+  enum State { IDLE, RUNNING, TERMINATING, STOPPED, JOINING, JOINED };

[Jarin, 2015/07/10 10:43:17]

Could we have some descriptions of what the states mean?

[binji, 2015/07/10 17:40:46]

Done.

 
   void ExecuteInThread();
   void Cleanup();