Add out-of-process memory logging stream parsing.

chrome/profiling/memlog_receiver.h

+// Copyright 2017 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 CHROME_PROFILING_MEMLOG_RECEIVER_H_
+#define CHROME_PROFILING_MEMLOG_RECEIVER_H_
+
+#include "base/memory/ref_counted.h"
+#include "chrome/common/profiling/memlog_stream.h"
+#include "chrome/profiling/address.h"
+#include "chrome/profiling/stack.h"
+
+namespace profiling {
+
+class Stack;
+
+// A log receiver is a sink for parsed allocation events. See also
+// MemlogStreamReceiver which is for the unparsed data blocks.
+class MemlogReceiver {
+ public:
+  MemlogReceiver() {}
+  virtual ~MemlogReceiver() {}
+
+  virtual void OnHeader(const StreamHeader& header) = 0;
+  virtual void OnAlloc(const AllocPacket& alloc_packet, Stack&& stack) = 0;
+  virtual void OnFree(const FreePacket& free_packet) = 0;
+  virtual void OnComplete() = 0;
+};
+
+}  // namespace profiling
+
+#endif  // CHROME_PROFILING_MEMLOG_RECEIVER_H_