Mojo: Plumb wait flags state through DataPipe::Awake...WaitersForStateChangeNoLock().

mojo/system/data_pipe.h

Index: mojo/system/data_pipe.h
diff --git a/mojo/system/data_pipe.h b/mojo/system/data_pipe.h
index a1d95adc281432e9286d25a2388a8213b631be54..79d6d7a6c4cb2fa4e3a1d3f73a67a68b2260a936 100644
--- a/mojo/system/data_pipe.h
+++ b/mojo/system/data_pipe.h
@@ -165,8 +165,10 @@ class MOJO_SYSTEM_IMPL_EXPORT DataPipe :
   }
 
  private:
-  void AwakeProducerWaitersForStateChangeNoLock();
-  void AwakeConsumerWaitersForStateChangeNoLock();
+  void AwakeProducerWaitersForStateChangeNoLock(
+      const WaitFlagsState& new_producer_state);
+  void AwakeConsumerWaitersForStateChangeNoLock(
+      const WaitFlagsState& new_consumer_state);
 
   bool has_local_producer_no_lock() const {
     lock_.AssertAcquired();