Load CMA backend from shared library

chromecast/media/cma/backend/media_pipeline_backend_default.cc

Index: chromecast/media/cma/backend/media_pipeline_backend_default.cc
diff --git a/chromecast/media/cma/backend/media_pipeline_backend_default.cc b/chromecast/media/cma/backend/media_pipeline_backend_default.cc
new file mode 100644
index 0000000000000000000000000000000000000000..498c5be257b58ad781fdf6a94cc97ae6d8e0cc80
--- /dev/null
+++ b/chromecast/media/cma/backend/media_pipeline_backend_default.cc
@@ -0,0 +1,39 @@
+// 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/backend/media_pipeline_backend_default.h"
+
+#include "chromecast/media/cma/backend/audio_pipeline_device_default.h"
+#include "chromecast/media/cma/backend/media_clock_device_default.h"
+#include "chromecast/media/cma/backend/video_pipeline_device_default.h"
+
+namespace chromecast {
+namespace media {
+
+MediaPipelineBackendDefault::MediaPipelineBackendDefault(
+    const MediaPipelineDeviceParams& params)
+    : params_(params) {}
+
+MediaPipelineBackendDefault::~MediaPipelineBackendDefault() {}
+
+MediaClockDevice* MediaPipelineBackendDefault::GetClock() {
+  if (!clock_)
+    clock_.reset(new MediaClockDeviceDefault());
+  return clock_.get();
+}
+
+AudioPipelineDevice* MediaPipelineBackendDefault::GetAudio() {
+  if (!audio_)
+    audio_.reset(new AudioPipelineDeviceDefault(params_, GetClock()));
+  return audio_.get();
+}
+
+VideoPipelineDevice* MediaPipelineBackendDefault::GetVideo() {
+  if (!video_)
+    video_.reset(new VideoPipelineDeviceDefault(params_, GetClock()));
+  return video_.get();
+}
+
+}  // namespace media
+}  // namespace chromecast