[mojo] Ports EDK

mojo/edk/system/data_pipe_control_message.h

Index: mojo/edk/system/data_pipe_control_message.h
diff --git a/mojo/edk/system/data_pipe_control_message.h b/mojo/edk/system/data_pipe_control_message.h
new file mode 100644
index 0000000000000000000000000000000000000000..7552dd01dc0ceef7ff4d23bdcc901348570e2493
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+++ b/mojo/edk/system/data_pipe_control_message.h
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+// Copyright 2016 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_CONTROL_MESSAGE_H_
+#define MOJO_EDK_SYSTEM_DATA_PIPE_CONTROL_MESSAGE_H_
+
+#include <stdint.h>
+
+#include "base/memory/scoped_ptr.h"
+#include "mojo/edk/embedder/scoped_platform_handle.h"
+#include "mojo/edk/system/ports/port_ref.h"
+#include "mojo/public/c/system/macros.h"
+
+namespace mojo {
+namespace edk {
+
+class NodeController;
+class PortsMessage;
+
+enum DataPipeCommand : uint32_t {
+  // Signal to the consumer that new data is available.
+  DATA_WAS_WRITTEN,
+
+  // Signal to the producer that data has been consumed.
+  DATA_WAS_READ,
+};
+
+// Message header for messages sent over a data pipe control port.
+struct MOJO_ALIGNAS(8) DataPipeControlMessage {
+  DataPipeCommand command;
+  uint32_t num_bytes;
+};
+
+void SendDataPipeControlMessage(NodeController* node_controller,
+                                const ports::PortRef& port,
+                                DataPipeCommand command,
+                                uint32_t num_bytes);
+
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_DATA_PIPE_CONTROL_MESSAGE_H_