Add pipe implementation for OOP memory logging

chrome/profiling/memlog_stream_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_STREAM_RECEIVER_H_
+#define CHROME_PROFILING_MEMLOG_STREAM_RECEIVER_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+
+namespace profiling {
+
+// A stream receiver is a sink for unparsed bytes. See also LogReceiver.
+class MemlogStreamReceiver
+    : public base::RefCountedThreadSafe<MemlogStreamReceiver> {
+ public:
+  MemlogStreamReceiver() {}
+  virtual ~MemlogStreamReceiver() {}
+
+  // Returns true on success, false on unrecoverable error (in which case no
+  // more blocks will be sent). May take a ref to the block, so the caller
+  // should not modify it later.
+  virtual void OnStreamData(std::unique_ptr<char[]> data, size_t sz) = 0;
+
+  virtual void OnStreamComplete() = 0;
+};
+
+}  // namespace profiling
+
+#endif  // CHROME_PROFILING_MEMLOG_STREAM_RECEIVER_H_