Load CMA backend from shared library

chromecast/public/media_codec_support_shlib.h

Index: chromecast/public/media_codec_support_shlib.h
diff --git a/chromecast/public/media_codec_support_shlib.h b/chromecast/public/media_codec_support_shlib.h
new file mode 100644
index 0000000000000000000000000000000000000000..168ecd81f6c80a74a6ed8be333f8d00b076e4312
--- /dev/null
+++ b/chromecast/public/media_codec_support_shlib.h
@@ -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.
+
+#ifndef CHROMECAST_PUBLIC_MEDIA_CODEC_SUPPORT_SHLIB_H_
+#define CHROMECAST_PUBLIC_MEDIA_CODEC_SUPPORT_SHLIB_H_
+
+#include <string>
+
+#include "chromecast_export.h"
+
+namespace chromecast {
+namespace media {
+
+// Provides information on which codecs are supported by a platform.
+// Note: these queries are made only in the renderer process.
+class CHROMECAST_EXPORT MediaCodecSupportShlib {
+ public:
+  // Possible values for 'is codec supported' query
+  enum CodecSupport {
+    // Codec is definitely supported on this platform.
+    kSupported,
+    // Codec is definitely not supported on this platform.
+    kNotSupported,
+    // No platform-specific constraints on codec's support.
+    // Support is determined by cast_shell default behaviour (which
+    // may include taking current HDMI-out capabilities into account).
+    kDefault
+  };
+
+  // Returns whether or not the given codec (passed in as a string
+  // representation of the codec id conforming to RFC 6381) is supported.
+  static CodecSupport IsSupported(const std::string& codec);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_PUBLIC_MEDIA_CODEC_SUPPORT_SHLIB_H_