Add flags and skeleton for profiling process.

chrome/profiling/profiling_main.h

Index: chrome/profiling/profiling_main.h
diff --git a/chrome/profiling/profiling_main.h b/chrome/profiling/profiling_main.h
new file mode 100644
index 0000000000000000000000000000000000000000..0d30b025934f0925666ce6cf6d26437001afef85
--- /dev/null
+++ b/chrome/profiling/profiling_main.h
@@ -0,0 +1,18 @@
+// 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_PROFILING_MAIN_H_
+#define CHROME_PROFILING_PROFILING_MAIN_H_
+
+namespace base {
+class CommandLine;
+}
+
+namespace profiling {
+
+int ProfilingMain(const base::CommandLine& cmdline);
+
+}  // namespace profiling
+
+#endif  // CHROME_PROFILING_PROFILING_MAIN_H_