Mojo: Wrap the satisfied/unsatisfied wait flags state in a single object.

mojo/system/waiter_list.h

 // Copyright 2013 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 MOJO_SYSTEM_WAITER_LIST_H_
 #define MOJO_SYSTEM_WAITER_LIST_H_
 
 #include <list>
 
 #include "base/basictypes.h"
 #include "mojo/public/c/system/types.h"
 #include "mojo/system/system_impl_export.h"
 
 namespace mojo {
 namespace system {
 
 class Waiter;
+struct WaitFlagsState;
 
 // |WaiterList| tracks all the |Waiter|s that are waiting on a given
 // handle/|Dispatcher|. There should be a |WaiterList| for each handle that can
 // be waited on (in any way). In the simple case, the |WaiterList| is owned by
 // the |Dispatcher|, whereas in more complex cases it is owned by the secondary
 // object (see simple_dispatcher.* and the explanatory comment in core.cc). This
 // class is thread-unsafe (all concurrent access must be protected by some
 // lock).
 class MOJO_SYSTEM_IMPL_EXPORT WaiterList {
  public:
   WaiterList();
   ~WaiterList();
 
+  void AwakeWaitersForStateChange(const WaitFlagsState& state);
+//FIXME Remove:
   void AwakeWaitersForStateChange(MojoWaitFlags satisfied_flags,
                                   MojoWaitFlags satisfiable_flags);
   void CancelAllWaiters();
   void AddWaiter(Waiter* waiter, MojoWaitFlags flags, MojoResult wake_result);
   void RemoveWaiter(Waiter* waiter);
 
  private:
   struct WaiterInfo {
     WaiterInfo(Waiter* waiter, MojoWaitFlags flags, MojoResult wake_result)
         : waiter(waiter), flags(flags), wake_result(wake_result) {}
 
     Waiter* waiter;
     MojoWaitFlags flags;
     MojoResult wake_result;
   };
   typedef std::list<WaiterInfo> WaiterInfoList;
 
   WaiterInfoList waiters_;
 
   DISALLOW_COPY_AND_ASSIGN(WaiterList);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_SYSTEM_WAITER_LIST_H_