Fix ThreadIterator_AddFindRemove test

runtime/vm/thread.h

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_THREAD_H_
 #define VM_THREAD_H_
 
 #include "vm/globals.h"
 #include "vm/handles.h"
 #include "vm/os_thread.h"
@@ skipping 353 matching lines @@
   }
   static intptr_t vm_tag_offset() {
     return OFFSET_OF(Thread, vm_tag_);
   }
 
   ThreadId id() const {
     ASSERT(id_ != OSThread::kInvalidThreadId);
     return id_;
   }
 
+  ThreadId join_id() const {
+    ASSERT(join_id_ != OSThread::kInvalidThreadJoinId);
+    return join_id_;
+  }
+
   void SetThreadInterrupter(ThreadInterruptCallback callback, void* data);
 
   bool IsThreadInterrupterEnabled(ThreadInterruptCallback* callback,
                                   void** data) const;
 
 #if defined(DEBUG)
 #define REUSABLE_HANDLE_SCOPE_ACCESSORS(object)                                \
   void set_reusable_##object##_handle_scope_active(bool value) {               \
     reusable_##object##_handle_scope_active_ = value;                          \
   }                                                                            \
@@ skipping 18 matching lines @@
   object& object##Handle() const {                                             \
     return *object##_handle_;                                                  \
   }
   REUSABLE_HANDLE_LIST(REUSABLE_HANDLE)
 #undef REUSABLE_HANDLE
 
   RawGrowableObjectArray* pending_functions();
 
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
+  static bool IsThreadInList(ThreadId join_id);
+
  private:
   template<class T> T* AllocateReusableHandle();
 
   static ThreadLocalKey thread_key_;
 
   const ThreadId id_;
+  const ThreadId join_id_;
   ThreadInterruptCallback thread_interrupt_callback_;
   void* thread_interrupt_data_;
   Isolate* isolate_;
   Heap* heap_;
   State state_;
   Mutex timeline_block_lock_;
   TimelineEventBlock* timeline_block_;
   StoreBufferBlock* store_buffer_block_;
   class Log* log_;
 #define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
@@ skipping 101 matching lines @@
 };
 
 #if defined(TARGET_OS_WINDOWS)
 // Clears the state of the current thread and frees the allocation.
 void WindowsThreadCleanUp();
 #endif
 
 }  // namespace dart
 
 #endif  // VM_THREAD_H_