Chromecast: split DummyMediaTaskRunner class into its own file.

chromecast/media/cma/base/dummy_media_task_runner.cc

+// Copyright 2015 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 "chromecast/media/cma/base/dummy_media_task_runner.h"
+
+#include "base/single_thread_task_runner.h"
+
+namespace chromecast {
+namespace media {
+
+DummyMediaTaskRunner::DummyMediaTaskRunner(
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)

[gunsch, 2015/06/05 18:09:20]

Dummy sounds like it doesn't do anything. This does, it's just a very simple
implementation of doing so. How about SimpleMediaTaskRunner?

[erickung1, 2015/06/05 19:28:19]

Done.

+  : task_runner_(task_runner) {
+}
+
+DummyMediaTaskRunner::~DummyMediaTaskRunner() {
+}
+
+bool DummyMediaTaskRunner::PostMediaTask(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task,
+    base::TimeDelta timestamp) {
+  return task_runner_->PostTask(from_here, task);
+}
+
+}  // namespace media
+}  // namespace chromecast