Load CMA backend from shared library

chromecast/public/task_runner.h

Index: chromecast/public/task_runner.h
diff --git a/chromecast/public/task_runner.h b/chromecast/public/task_runner.h
new file mode 100644
index 0000000000000000000000000000000000000000..ced3a49b77483ebbf8b9d5533b501709d652d51a
--- /dev/null
+++ b/chromecast/public/task_runner.h
@@ -0,0 +1,33 @@
+// 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_PUBLIC_TASK_RUNNER_H_
+#define CHROMECAST_PUBLIC_TASK_RUNNER_H_
+
+#include <stdint.h>
+
+namespace chromecast {
+
+// Provides a way for vendor libraries to run code on a specific thread.
+// For example, used in media APIs to allow code to be run on the media thread.
+class TaskRunner {
+ public:
+  // Subclass and implement 'Run' to supply code to be run by PostTask or
+  // PostDelayedTask.  They both take ownership of the Task object passed in
+  // and will delete after running the Task.
+  class Task {
+   public:
+    virtual ~Task() {}
+    virtual void Run() = 0;
+  };
+
+  virtual ~TaskRunner() {}
+
+  virtual bool BelongsToCurrentThread() = 0;
+  virtual bool PostTask(Task* task, uint64_t delay_milliseconds) = 0;

[gunsch, 2015/07/29 17:04:20]

Maybe document that:
a) delay_milliseconds must be >= 0 (and potentially DCHECK that)
b) task will always be added to the thread's task queue, and 0ms does not
necessarily mean executing immediately

[halliwell, 2015/07/29 19:58:20]

it's a uint, so no need to check >= 0.
(b) = done.

+};
+
+}  // namespace chromecast
+
+#endif  // CHROMECAST_PUBLIC_TASK_RUNNER_H_