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

chrome/profiling/profiling_globals.cc

Index: chrome/profiling/profiling_globals.cc
diff --git a/chrome/profiling/profiling_globals.cc b/chrome/profiling/profiling_globals.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5cd552e70aa231527188a8dd2af5c38fb6a79017
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+++ b/chrome/profiling/profiling_globals.cc
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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.
+
+#include "chrome/profiling/profiling_globals.h"
+
+#include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
+#include "build/build_config.h"
+
+namespace profiling {
+
+ProfilingGlobals::ProfilingGlobals()
+    : io_thread_("IO thread") {
+#if defined(OS_WIN)
+  io_thread_.init_com_with_mta(true);
+#endif
+  base::Thread::Options options;
+  options.message_loop_type = base::MessageLoop::TYPE_IO;
+  io_thread_.StartWithOptions(options);
+}
+
+ProfilingGlobals::~ProfilingGlobals() {}
+
+// static
+ProfilingGlobals* ProfilingGlobals::Get() {
+  static ProfilingGlobals singleton;
+  return &singleton;
+}
+
+base::TaskRunner* ProfilingGlobals::GetIORunner() {
+  return io_thread_.task_runner().get();
+}
+
+scoped_refptr<base::SingleThreadTaskRunner> ProfilingGlobals::GetMainThread()
+    const {
+  CHECK(base::MessageLoop::current() == main_message_loop_);
+  return main_message_loop_->task_runner();
+}
+
+void ProfilingGlobals::RunMainMessageLoop() {
+  // TODO(brettw) if we never add anything interesting on the main thread here,
+  // we can change this so the main thread *is* the I/O thread. This will save
+  // some resources.
+  base::MessageLoopForUI message_loop;
+  DCHECK(!main_message_loop_);
+  main_message_loop_ = &message_loop;
+
+  base::RunLoop run_loop;
+  run_loop.Run();
+
+  main_message_loop_ = nullptr;
+}
+
+void ProfilingGlobals::QuitWhenIdle() {
+  main_message_loop_->QuitWhenIdle();
+}
+
+}  // namespace profiling