Moved zones and zone related stuff in its own directory.

src/zone/accounting-allocator.h

+// Copyright 2016 the V8 project 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 V8_ZONE_ACCOUNTING_ALLOCATOR_H_
+#define V8_ZONE_ACCOUNTING_ALLOCATOR_H_
+
+#include "include/v8-platform.h"
+#include "src/base/atomic-utils.h"
+#include "src/base/atomicops.h"
+#include "src/base/macros.h"
+#include "src/base/platform/mutex.h"
+#include "src/base/platform/semaphore.h"
+#include "src/base/platform/time.h"
+#include "src/zone/zone-segment.h"
+
+namespace v8 {
+namespace internal {
+
+class AccountingAllocator {
+ public:
+  AccountingAllocator() = default;
+  virtual ~AccountingAllocator() = default;
+
+  virtual Segment* AllocateSegment(size_t bytes);
+  virtual void FreeSegment(Segment* memory);
+
+  size_t GetCurrentMemoryUsage() const;
+  size_t GetMaxMemoryUsage() const;
+
+ private:
+  base::AtomicWord current_memory_usage_ = 0;
+  base::AtomicWord max_memory_usage_ = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(AccountingAllocator);
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_ZONE_ACCOUNTING_ALLOCATOR_H_