Add |joinable| to Thread::Options

base/threading/platform_thread.h

Index: base/threading/platform_thread.h
diff --git a/base/threading/platform_thread.h b/base/threading/platform_thread.h
index 41e8291af98b357af6ea268d7627bff6ce861d98..4c2db8aba78a1f817288bce6b11c1f29b2397b5c 100644
--- a/base/threading/platform_thread.h
+++ b/base/threading/platform_thread.h
@@ -175,6 +175,12 @@ class BASE_EXPORT PlatformThread {
   // PlatformThreadHandle.
   static bool CreateNonJoinable(size_t stack_size, Delegate* delegate);
 
+  // CreateNonJoinableWithPriority() does the same thing as CreateNonJoinable()
+  // except the priority of the thread is set based on |priority|.
+  static bool CreateNonJoinableWithPriority(size_t stack_size,
+                                            Delegate* delegate,
+                                            ThreadPriority priority);
+
   // Joins with a thread created via the Create function.  This function blocks
   // the caller until the designated thread exits.  This will invalidate
   // |thread_handle|.