Make the data pipe "cancel all state" functions cancel two-phase operations.

mojo/edk/system/data_pipe.h

Index: mojo/edk/system/data_pipe.h
diff --git a/mojo/edk/system/data_pipe.h b/mojo/edk/system/data_pipe.h
index bdd298defda029a6f9abacc5b97aa467642cd53b..4437b76bf84071c067b1404e129fb07ffcb95106 100644
--- a/mojo/edk/system/data_pipe.h
+++ b/mojo/edk/system/data_pipe.h
@@ -174,6 +174,10 @@ class DataPipe final : public ChannelEndpointClient {
   std::unique_ptr<DataPipeImpl> ReplaceImplNoLock(
       std::unique_ptr<DataPipeImpl> new_impl)
       MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+
+  void ProducerCancelAllStateNoLock() MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+  void ConsumerCancelAllStateNoLock() MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
+
   void SetProducerClosedNoLock() MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
   void SetConsumerClosedNoLock() MOJO_EXCLUSIVE_LOCKS_REQUIRED(mutex_);