Add out-of-process memory logging stream parsing.

chrome/profiling/memlog_receiver.h

Index: chrome/profiling/memlog_receiver.h
diff --git a/chrome/profiling/memlog_receiver.h b/chrome/profiling/memlog_receiver.h
new file mode 100644
index 0000000000000000000000000000000000000000..49f94fbbd48af512a972e925caa1e539f7fab26a
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+++ b/chrome/profiling/memlog_receiver.h
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+// 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 <vector>
+
+#include "base/memory/ref_counted.h"
+#include "chrome/common/profiling/memlog_stream.h"
+#include "chrome/profiling/address.h"
+
+namespace profiling {
+
+// A log receiver is a sink for parsed allocation events. See also
+// MemlogStreamReceiver which is for the unparsed data blocks.
+class MemlogReceiver {
+ public:
+  virtual ~MemlogReceiver() {}
+
+  virtual void OnHeader(const StreamHeader& header) = 0;
+  virtual void OnAlloc(const AllocPacket& alloc_packet,
+                       std::vector<Address>&& stack) = 0;
+  virtual void OnFree(const FreePacket& free_packet) = 0;
+  virtual void OnComplete() = 0;
+};
+
+}  // namespace profiling
+
+#endif  // CHROME_PROFILING_MEMLOG_RECEIVER_H_