Create snapshot/mac and move some files from snapshot and util to there

snapshot/memory_snapshot_mac.h

-// Copyright 2014 The Crashpad Authors. All rights reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#ifndef CRASHPAD_SNAPSHOT_MEMORY_SNAPSHOT_MAC_H_
-#define CRASHPAD_SNAPSHOT_MEMORY_SNAPSHOT_MAC_H_
-
-#include <stdint.h>
-#include <sys/types.h>
-
-#include "base/basictypes.h"
-#include "snapshot/memory_snapshot.h"
-#include "util/mac/process_reader.h"
-#include "util/misc/initialization_state_dcheck.h"
-
-namespace crashpad {
-namespace internal {
-
-//! \brief A MemorySnapshot of a memory region in a process on the running
-//!     system, when the system runs Mac OS X.
-class MemorySnapshotMac final : public MemorySnapshot {
- public:
-  MemorySnapshotMac();
-  ~MemorySnapshotMac();
-
-  //! \brief Initializes the object.
-  //!
-  //! Memory is read lazily. No attempt is made to read the memory snapshot data
-  //! until Read() is called, and the memory snapshot data is discared when
-  //! Read() returns.
-  //!
-  //! \param[in] process_reader A reader for the process being snapshotted.
-  //! \param[in] address The base address of the memory region to snapshot, in
-  //!     the snapshot process’ address space.
-  //! \param[in] size The size of the memory region to snapshot.
-  void Initialize(ProcessReader* process_reader,
-                  uint64_t address,
-                  uint64_t size);
-
-  // MemorySnapshot:
-
-  uint64_t Address() const override;
-  size_t Size() const override;
-  bool Read(Delegate* delegate) const override;
-
- private:
-  ProcessReader* process_reader_;  // weak
-  uint64_t address_;
-  uint64_t size_;
-  InitializationStateDcheck initialized_;
-
-  DISALLOW_COPY_AND_ASSIGN(MemorySnapshotMac);
-};
-
-}  // namespace internal
-}  // namespace crashpad
-
-#endif  // CRASHPAD_SNAPSHOT_MEMORY_SNAPSHOT_MAC_H_