EDK: Add implementation of data pipe consumer read threshold stuff.

mojo/edk/system/data_pipe_consumer_dispatcher.h

Index: mojo/edk/system/data_pipe_consumer_dispatcher.h
diff --git a/mojo/edk/system/data_pipe_consumer_dispatcher.h b/mojo/edk/system/data_pipe_consumer_dispatcher.h
index 588034614cafdd73510f2f915bfd4314acaec8a8..7b69568e0b6e22ea9e3c6b379c8c502be1a0cc19 100644
--- a/mojo/edk/system/data_pipe_consumer_dispatcher.h
+++ b/mojo/edk/system/data_pipe_consumer_dispatcher.h
@@ -47,6 +47,11 @@ class DataPipeConsumerDispatcher final : public Dispatcher {
   void CloseImplNoLock() override;
   util::RefPtr<Dispatcher> CreateEquivalentDispatcherAndCloseImplNoLock()
       override;
+  MojoResult SetDataPipeConsumerOptionsImplNoLock(
+      UserPointer<const MojoDataPipeConsumerOptions> options) override;
+  MojoResult GetDataPipeConsumerOptionsImplNoLock(
+      UserPointer<MojoDataPipeConsumerOptions> options,
+      uint32_t options_num_bytes) override;
   MojoResult ReadDataImplNoLock(UserPointer<void> elements,
                                 UserPointer<uint32_t> num_bytes,
                                 MojoReadDataFlags flags) override;