Load CMA backend from shared library

chromecast/base/task_runner_impl.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/base/task_runner_impl.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+
+namespace chromecast {
+
+TaskRunnerImpl::TaskRunnerImpl()
+    : runner_(base::ThreadTaskRunnerHandle::Get()) {
+  DCHECK(runner_.get());
+}
+
+TaskRunnerImpl::~TaskRunnerImpl() {}
+
+bool TaskRunnerImpl::PostTask(Task* task, uint64_t delay_milliseconds) {
+  DCHECK(task);
+  if (delay_milliseconds == 0 && runner_->BelongsToCurrentThread()) {
+    task->Run();
+    delete task;
+    return true;
+  }
+
+  // TODO(halliwell): FROM_HERE is misleading, we should consider a macro for
+  // vendor backends to send the callsite info.
+  return runner_->PostDelayedTask(
+      FROM_HERE, base::Bind(&Task::Run, base::Owned(task)),
+      base::TimeDelta::FromMilliseconds(delay_milliseconds));
+}
+
+}  // namespace chromecast