Launch browser when --memlog is specified on the command line.

chrome/profiling/profiling_globals.h

Index: chrome/profiling/profiling_globals.h
diff --git a/chrome/profiling/profiling_globals.h b/chrome/profiling/profiling_globals.h
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index 0000000000000000000000000000000000000000..84060a7664e1f4ffc4ce675aa87775bf2f35e92b
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+++ b/chrome/profiling/profiling_globals.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_PROFILING_GLOBALS_H_
+#define CHROME_PROFILING_PROFILING_GLOBALS_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/thread.h"
+
+namespace base {
+class MessageLoopForUI;
+class SingleThreadTaskRunner;
+class TaskRunner;
+}  // namespace base
+
+namespace profiling {
+
+class ProfilingGlobals {
+ public:
+  static ProfilingGlobals* Get();
+
+  base::TaskRunner* GetIORunner();
+
+  // Returns non-null when inside RunMainMessageLoop. Call only on the
+  // main thread (otherwise there's a shutdown race).
+  scoped_refptr<base::SingleThreadTaskRunner> GetMainThread() const;
+
+  void RunMainMessageLoop();
+  void QuitWhenIdle();
+
+ private:
+  ProfilingGlobals();
+  ~ProfilingGlobals();
+
+  // Non-null inside RunMainMessageLoop.
+  base::MessageLoopForUI* main_message_loop_ = nullptr;
+
+  base::Thread io_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProfilingGlobals);
+};
+
+}  // namespace profiling
+
+#endif  // CHROME_PROFILING_PROFILING_GLOBALS_H_