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

mojo/system/local_data_pipe.h

Index: mojo/system/local_data_pipe.h
diff --git a/mojo/system/local_data_pipe.h b/mojo/system/local_data_pipe.h
index 973ab68de21b0664a5a8463aedd35b34db0348f0..7eb0f5f3d423368e201e2b1447a0bfe0677dedfe 100644
--- a/mojo/system/local_data_pipe.h
+++ b/mojo/system/local_data_pipe.h
@@ -40,8 +40,7 @@ class MOJO_SYSTEM_IMPL_EXPORT LocalDataPipe : public DataPipe {
       bool all_or_none) OVERRIDE;
   virtual MojoResult ProducerEndWriteDataImplNoLock(
       uint32_t num_bytes_written) OVERRIDE;
-  virtual MojoWaitFlags ProducerSatisfiedFlagsNoLock() OVERRIDE;
-  virtual MojoWaitFlags ProducerSatisfiableFlagsNoLock() OVERRIDE;
+  virtual WaitFlagsState ProducerGetWaitFlagsStateNoLock() const OVERRIDE;
   virtual void ConsumerCloseImplNoLock() OVERRIDE;
   virtual MojoResult ConsumerReadDataImplNoLock(void* elements,
                                                 uint32_t* num_bytes,
@@ -54,8 +53,7 @@ class MOJO_SYSTEM_IMPL_EXPORT LocalDataPipe : public DataPipe {
                                                      bool all_or_none) OVERRIDE;
   virtual MojoResult ConsumerEndReadDataImplNoLock(
       uint32_t num_bytes_read) OVERRIDE;
-  virtual MojoWaitFlags ConsumerSatisfiedFlagsNoLock() OVERRIDE;
-  virtual MojoWaitFlags ConsumerSatisfiableFlagsNoLock() OVERRIDE;
+  virtual WaitFlagsState ConsumerGetWaitFlagsStateNoLock() const OVERRIDE;
 
   void EnsureBufferNoLock();
   void DestroyBufferNoLock();