Revert "Move mojo edk into mojo/edk"

mojo/edk/embedder/simple_platform_shared_buffer.h

-// Copyright 2014 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_EMBEDDER_SIMPLE_PLATFORM_SHARED_BUFFER_H_
-#define MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SHARED_BUFFER_H_
-
-#include <stddef.h>
-
-#include "base/macros.h"
-#include "mojo/edk/embedder/platform_shared_buffer.h"
-#include "mojo/edk/system/system_impl_export.h"
-
-namespace mojo {
-namespace embedder {
-
-// A simple implementation of |PlatformSharedBuffer|.
-class MOJO_SYSTEM_IMPL_EXPORT SimplePlatformSharedBuffer
-    : public PlatformSharedBuffer {
- public:
-  // Creates a shared buffer of size |num_bytes| bytes (initially zero-filled).
-  // |num_bytes| must be nonzero. Returns null on failure.
-  static SimplePlatformSharedBuffer* Create(size_t num_bytes);
-
-  static SimplePlatformSharedBuffer* CreateFromPlatformHandle(
-      size_t num_bytes,
-      ScopedPlatformHandle platform_handle);
-
-  // |PlatformSharedBuffer| implementation:
-  virtual size_t GetNumBytes() const override;
-  virtual scoped_ptr<PlatformSharedBufferMapping> Map(size_t offset,
-                                                      size_t length) override;
-  virtual bool IsValidMap(size_t offset, size_t length) override;
-  virtual scoped_ptr<PlatformSharedBufferMapping> MapNoCheck(
-      size_t offset,
-      size_t length) override;
-  virtual ScopedPlatformHandle DuplicatePlatformHandle() override;
-  virtual ScopedPlatformHandle PassPlatformHandle() override;
-
- private:
-  explicit SimplePlatformSharedBuffer(size_t num_bytes);
-  virtual ~SimplePlatformSharedBuffer();
-
-  // Implemented in simple_platform_shared_buffer_{posix,win}.cc:
-
-  // This is called by |Create()| before this object is given to anyone.
-  bool Init();
-
-  // This is like |Init()|, but for |CreateFromPlatformHandle()|. (Note: It
-  // should verify that |platform_handle| is an appropriate handle for the
-  // claimed |num_bytes_|.)
-  bool InitFromPlatformHandle(ScopedPlatformHandle platform_handle);
-
-  // The platform-dependent part of |Map()|; doesn't check arguments.
-  scoped_ptr<PlatformSharedBufferMapping> MapImpl(size_t offset, size_t length);
-
-  const size_t num_bytes_;
-
-  // This is set in |Init()|/|InitFromPlatformHandle()| and never modified
-  // (except by |PassPlatformHandle()|; see the comments above its declaration),
-  // hence does not need to be protected by a lock.
-  ScopedPlatformHandle handle_;
-
-  DISALLOW_COPY_AND_ASSIGN(SimplePlatformSharedBuffer);
-};
-
-// An implementation of |PlatformSharedBufferMapping|, produced by
-// |SimplePlatformSharedBuffer|.
-class MOJO_SYSTEM_IMPL_EXPORT SimplePlatformSharedBufferMapping
-    : public PlatformSharedBufferMapping {
- public:
-  virtual ~SimplePlatformSharedBufferMapping();
-
-  virtual void* GetBase() const override;
-  virtual size_t GetLength() const override;
-
- private:
-  friend class SimplePlatformSharedBuffer;
-
-  SimplePlatformSharedBufferMapping(void* base,
-                                    size_t length,
-                                    void* real_base,
-                                    size_t real_length)
-      : base_(base),
-        length_(length),
-        real_base_(real_base),
-        real_length_(real_length) {}
-  void Unmap();
-
-  void* const base_;
-  const size_t length_;
-
-  void* const real_base_;
-  const size_t real_length_;
-
-  DISALLOW_COPY_AND_ASSIGN(SimplePlatformSharedBufferMapping);
-};
-
-}  // namespace embedder
-}  // namespace mojo
-
-#endif  // MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SHARED_BUFFER_H_