base: Support setting thread priorities generically.

base/threading/thread.h

 // Copyright (c) 2012 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 BASE_THREADING_THREAD_H_
 #define BASE_THREADING_THREAD_H_
 
 #include <string>
 
 #include "base/base_export.h"
@@ skipping 124 matching lines @@
 
   // The native thread handle.
   PlatformThreadHandle thread_handle() { return thread_; }
 
   // The thread ID.
   PlatformThreadId thread_id() const { return thread_id_; }
 
   // Returns true if the thread has been started, and not yet stopped.
   bool IsRunning() const;
 
+  // Sets the thread priority. The thread must already be started.
+  void SetPriority(ThreadPriority priority);
+
  protected:
   // Called just prior to starting the message loop
   virtual void Init() {}
 
   // Called to start the message loop
   virtual void Run(MessageLoop* message_loop);
 
   // Called just after the message loop ends
   virtual void CleanUp() {}
 
@@ skipping 49 matching lines @@
   std::string name_;
 
   friend void ThreadQuitHelper();
 
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 }  // namespace base
 
 #endif  // BASE_THREADING_THREAD_H_