Chromium -> Mojo roll.

base/memory/discardable_memory_shmem_allocator.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 BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_
-#define BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_
-
-#include "base/base_export.h"
-#include "base/memory/scoped_ptr.h"
-
-namespace base {
-
-// TODO(reveman): Remove this by having allocator interface return
-// real DiscardableMemory instances. crbug.com/442945
-class BASE_EXPORT DiscardableMemoryShmemChunk {
- public:
-  virtual ~DiscardableMemoryShmemChunk() {}
-
-  virtual bool Lock() = 0;
-  virtual void Unlock() = 0;
-  virtual void* Memory() const = 0;
-};
-
-class BASE_EXPORT DiscardableMemoryShmemAllocator {
- public:
-  // Returns the allocator instance.
-  static DiscardableMemoryShmemAllocator* GetInstance();
-
-  // Sets the allocator instance. Can only be called once, e.g. on startup.
-  // Ownership of |instance| remains with the caller.
-  static void SetInstance(DiscardableMemoryShmemAllocator* allocator);
-
-  virtual scoped_ptr<DiscardableMemoryShmemChunk>
-  AllocateLockedDiscardableMemory(size_t size) = 0;
-
- protected:
-  virtual ~DiscardableMemoryShmemAllocator() {}
-};
-
-}  // namespace base
-
-#endif  // BASE_MEMORY_DISCARDABLE_MEMORY_SHMEM_ALLOCATOR_H_