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

mojo/edk/system/data_pipe_consumer_dispatcher.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_EDK_SYSTEM_DATA_PIPE_CONSUMER_DISPATCHER_H_
 #define MOJO_EDK_SYSTEM_DATA_PIPE_CONSUMER_DISPATCHER_H_
 
 #include "mojo/edk/system/dispatcher.h"
 #include "mojo/edk/util/ref_ptr.h"
 #include "mojo/edk/util/thread_annotations.h"
@@ skipping 29 matching lines @@
 
  private:
   DataPipeConsumerDispatcher();
   ~DataPipeConsumerDispatcher() override;
 
   // |Dispatcher| protected methods:
   void CancelAllAwakablesNoLock() override;
   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;
   MojoResult BeginReadDataImplNoLock(UserPointer<const void*> buffer,
                                      UserPointer<uint32_t> buffer_num_bytes,
                                      MojoReadDataFlags flags) override;
   MojoResult EndReadDataImplNoLock(uint32_t num_bytes_read) override;
   HandleSignalsState GetHandleSignalsStateImplNoLock() const override;
   MojoResult AddAwakableImplNoLock(Awakable* awakable,
                                    MojoHandleSignals signals,
@@ skipping 16 matching lines @@
   // This will be null if closed.
   util::RefPtr<DataPipe> data_pipe_ MOJO_GUARDED_BY(mutex());
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(DataPipeConsumerDispatcher);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_DATA_PIPE_CONSUMER_DISPATCHER_H_