Load CMA backend from shared library

chromecast/base/task_runner_impl.h

+// 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.
+
+#ifndef CHROMECAST_BASE_TASK_RUNNER_IMPL_H_
+#define CHROMECAST_BASE_TASK_RUNNER_IMPL_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "chromecast/public/task_runner.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace chromecast {
+
+// Implementation of public TaskRunner interface that just calls
+// base::ThreadTaskRunnerHandle at construction time and uses it to post.
+class TaskRunnerImpl : public TaskRunner {
+ public:
+  TaskRunnerImpl();
+  ~TaskRunnerImpl() override;
+
+  bool PostTask(Task* task, uint64_t delay_milliseconds) override;
+
+  const scoped_refptr<base::SingleThreadTaskRunner>& runner() const {

[byungchul, 2015/08/18 00:06:36]

It should return scoped_refptr<base::SingleThreadTaskRunner>. Otherwise, the
caller may not increase ref-count like:

const scoped_refptr<>& runner = task_runner->runner();

+    return runner_;
+  }
+
+ private:
+  const scoped_refptr<base::SingleThreadTaskRunner> runner_;
+
+  DISALLOW_COPY_AND_ASSIGN(TaskRunnerImpl);
+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_BASE_TASK_RUNNER_IMPL_H_