Revert "Move mojo edk into mojo/edk"

mojo/edk/system/message_pipe_endpoint.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_MESSAGE_PIPE_ENDPOINT_H_
-#define MOJO_EDK_SYSTEM_MESSAGE_PIPE_ENDPOINT_H_
-
-#include <stdint.h>
-
-#include <vector>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "mojo/edk/system/dispatcher.h"
-#include "mojo/edk/system/memory.h"
-#include "mojo/edk/system/message_in_transit.h"
-#include "mojo/edk/system/system_impl_export.h"
-#include "mojo/public/c/system/message_pipe.h"
-#include "mojo/public/c/system/types.h"
-
-namespace mojo {
-namespace system {
-
-class ChannelEndpoint;
-class Waiter;
-
-// This is an interface to one of the ends of a message pipe, and is used by
-// |MessagePipe|. Its most important role is to provide a sink for messages
-// (i.e., a place where messages can be sent). It has a secondary role: When the
-// endpoint is local (i.e., in the current process), there'll be a dispatcher
-// corresponding to the endpoint. In that case, the implementation of
-// |MessagePipeEndpoint| also implements the functionality required by the
-// dispatcher, e.g., to read messages and to wait. Implementations of this class
-// are not thread-safe; instances are protected by |MesssagePipe|'s lock.
-class MOJO_SYSTEM_IMPL_EXPORT MessagePipeEndpoint {
- public:
-  virtual ~MessagePipeEndpoint() {}
-
-  enum Type { kTypeLocal, kTypeProxy };
-  virtual Type GetType() const = 0;
-
-  // All implementations must implement these.
-  // Returns false if the endpoint should be closed and destroyed, else true.
-  virtual bool OnPeerClose() = 0;
-  // Implements |MessagePipe::EnqueueMessage()|. The major differences are that:
-  //  a) Dispatchers have been vetted and cloned/attached to the message.
-  //  b) At this point, we cannot report failure (if, e.g., a channel is torn
-  //     down at this point, we should silently swallow the message).
-  virtual void EnqueueMessage(scoped_ptr<MessageInTransit> message) = 0;
-  virtual void Close() = 0;
-
-  // Implementations must override these if they represent a local endpoint,
-  // i.e., one for which there's a |MessagePipeDispatcher| (and thus a handle).
-  // An implementation for a proxy endpoint (for which there's no dispatcher)
-  // needs not override these methods, since they should never be called.
-  //
-  // These methods implement the methods of the same name in |MessagePipe|,
-  // though |MessagePipe|'s implementation may have to do a little more if the
-  // operation involves both endpoints.
-  virtual void CancelAllWaiters();
-  virtual MojoResult ReadMessage(UserPointer<void> bytes,
-                                 UserPointer<uint32_t> num_bytes,
-                                 DispatcherVector* dispatchers,
-                                 uint32_t* num_dispatchers,
-                                 MojoReadMessageFlags flags);
-  virtual HandleSignalsState GetHandleSignalsState() const;
-  virtual MojoResult AddWaiter(Waiter* waiter,
-                               MojoHandleSignals signals,
-                               uint32_t context,
-                               HandleSignalsState* signals_state);
-  virtual void RemoveWaiter(Waiter* waiter, HandleSignalsState* signals_state);
-
-  // Implementations must override these if they represent a proxy endpoint. An
-  // implementation for a local endpoint needs not override these methods, since
-  // they should never be called.
-  virtual void Attach(ChannelEndpoint* channel_endpoint);
-
- protected:
-  MessagePipeEndpoint() {}
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(MessagePipeEndpoint);
-};
-
-}  // namespace system
-}  // namespace mojo
-
-#endif  // MOJO_EDK_SYSTEM_MESSAGE_PIPE_ENDPOINT_H_