Add ChannelProxy benchmark to ipc_perftests.

base/test/test_io_thread.h

+// Copyright 2013 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 BASE_TEST_TEST_IO_THREAD_H_
+#define BASE_TEST_TEST_IO_THREAD_H_
+
+#include "base/callback_forward.h"
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/task_runner.h"
+#include "base/threading/thread.h"
+#include "base/time/time.h"
+
+namespace base {
+
+// Create and run an IO thread with a MessageLoop, and
+// making the MessageLoop accessible from its client.
+// It also provides some ideaomatic API like PostTaskAndWait().

[viettrungluu, 2014/08/28 00:07:31]

spelling: ideaomatic -> ideomatic

[Hajime Morrita, 2014/08/28 00:24:35]

Done.

+class TestIOThread {
+ public:
+  enum Mode { kAutoStart, kManualStart };
+  explicit TestIOThread(Mode mode);
+  // Stops the I/O thread if necessary.
+  ~TestIOThread();
+
+  // |Start()|/|Stop()| should only be called from the main (creation) thread.
+  // After |Stop()|, |Start()| may be called again to start a new I/O thread.
+  // |Stop()| may be called even when the I/O thread is not started.
+  void Start();
+  void Stop();
+
+  // Post |task| to the IO thread.
+  void PostTask(const tracked_objects::Location& from_here,
+                const base::Closure& task);
+  // Posts |task| to the IO-thread, spins the thread's message loop until

[viettrungluu, 2014/08/28 00:07:31]

This description is inaccurate. It actually waits on a WaitableEvent.

(IIRC, it's done this way since the main/creation thread may not have a message
loop, especially in tests.)

[Hajime Morrita, 2014/08/28 00:24:34]

Ugh right. fixed.

+  // the posted |task| is executed, then returns.
+  void PostTaskAndWait(const tracked_objects::Location& from_here,
+                       const base::Closure& task);
+
+  base::MessageLoopForIO* message_loop() {
+    return static_cast<base::MessageLoopForIO*>(io_thread_.message_loop());
+  }
+
+  scoped_refptr<SingleThreadTaskRunner> task_runner() {
+    return message_loop()->task_runner();
+  }
+
+ private:
+  base::Thread io_thread_;
+  bool io_thread_started_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestIOThread);
+};
+
+}  // namespace base
+
+#endif  // BASE_TEST_TEST_IO_THREAD_H_