Load CMA backend from shared library

chromecast/media/cma/pipeline/video_pipeline_device_client_impl.cc

Index: chromecast/media/cma/pipeline/video_pipeline_device_client_impl.cc
diff --git a/chromecast/media/cma/pipeline/video_pipeline_device_client_impl.cc b/chromecast/media/cma/pipeline/video_pipeline_device_client_impl.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a604be36e20af3556156a9bade265f88fe0f6745
--- /dev/null
+++ b/chromecast/media/cma/pipeline/video_pipeline_device_client_impl.cc
@@ -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.
+
+#include "chromecast/media/cma/pipeline/video_pipeline_device_client_impl.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
+#include "chromecast/public/graphics_types.h"
+
+namespace chromecast {
+namespace media {
+
+VideoPipelineDeviceClientImpl::VideoPipelineDeviceClientImpl(
+    const SizeChangeCB& size_change_cb)
+    : size_change_cb_(size_change_cb),
+      task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
+
+VideoPipelineDeviceClientImpl::~VideoPipelineDeviceClientImpl() {}
+
+void VideoPipelineDeviceClientImpl::OnNaturalSizeChanged(const Size& size) {
+  if (task_runner_->BelongsToCurrentThread()) {
+    if (!size_change_cb_.is_null())
+      size_change_cb_.Run(size);
+  } else {
+    task_runner_->PostTask(FROM_HERE, base::Bind(size_change_cb_, size));
+  }
+}
+
+}  // namespace media
+}  // namespace chromecast