Add out-of-process memory logging stream parsing.

chrome/profiling/memlog_connection_manager.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_CONNECTION_MANAGER_H_
+#define CHROME_PROFILING_MEMLOG_CONNECTION_MANAGER_H_
+
+#include <string>
+
+#include "base/containers/flat_map.h"
+#include "base/macros.h"
+#include "build/build_config.h"
+#include "chrome/profiling/memlog_receiver_pipe_server.h"
+#include "chrome/profiling/stack_storage.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace profiling {
+
+// Manages all connections and logging for each process. Pipes are supplied by
+// the pipe server and this class will connect them to a parser and logger.
+class MemlogConnectionManager {
+ public:
+  MemlogConnectionManager();
+  ~MemlogConnectionManager();
+
+  // Starts listening for connections.
+  void StartConnections(const std::string& pipe_id);
+
+ private:
+  struct Connection;
+
+  // Called by the pipe server when a new pipe is created.
+  void OnNewConnection(scoped_refptr<MemlogReceiverPipe> new_pipe);
+
+  // Notification that a connection is complete. Unlike OnNewConnection which
+  // is signaled by the pipe server, this is signaled by the allocation tracker
+  // to ensure that the pipeline for this process has been flushed of all
+  // messages.
+  void OnConnectionComplete(int process_id);
+
+  void OnConnectionCompleteThunk(
+      scoped_refptr<base::SingleThreadTaskRunner> main_loop,
+      int process_id);
+
+  scoped_refptr<MemlogReceiverPipeServer> server_;
+
+  // Maps process ID to the connection information for it.
+  base::flat_map<int, std::unique_ptr<Connection>> connections_;
+
+  DISALLOW_COPY_AND_ASSIGN(MemlogConnectionManager);
+};
+
+}  // namespace profiling
+
+#endif  // CHROME_PROFILING_MEMLOG_CONNECTION_MANAGER_H_