Add pipe implementation for OOP memory logging

chrome/common/profiling/memlog_stream.h

Index: chrome/common/profiling/memlog_stream.h
diff --git a/chrome/common/profiling/memlog_stream.h b/chrome/common/profiling/memlog_stream.h
new file mode 100644
index 0000000000000000000000000000000000000000..7a9e98d2c4a700473ceabd9632777e12a823586d
--- /dev/null
+++ b/chrome/common/profiling/memlog_stream.h
@@ -0,0 +1,20 @@
+// 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_COMMON_PROFILING_MEMLOG_STREAM_H_
+#define CHROME_COMMON_PROFILING_MEMLOG_STREAM_H_
+
+#include "build/build_config.h"
+
+namespace profiling {
+
+#if defined(OS_WIN)
+// Prefix for pipe name for communicating between chrome processes and the
+// memlog process. The pipe ID is appended to this to get the pipe name.
+extern const wchar_t kWindowsPipePrefix[];
+#endif  // OS_WIN
+
+}  // namespace profiling
+
+#endif  // CHROME_COMMON_PROFILING_MEMLOG_STREAM_H_