Introduce VideoConfig/AudioConfig class for CMA backend

chromecast/media/cma/backend/video_pipeline_device.h

Index: chromecast/media/cma/backend/video_pipeline_device.h
diff --git a/chromecast/media/cma/backend/video_pipeline_device.h b/chromecast/media/cma/backend/video_pipeline_device.h
index 30527407b9fd7aafde7579ad82558bf167c29d16..1b54940f6f6a3464cc0dc2c74f6db3d76ef1f5ff 100644
--- a/chromecast/media/cma/backend/video_pipeline_device.h
+++ b/chromecast/media/cma/backend/video_pipeline_device.h
@@ -13,13 +13,10 @@ namespace gfx {
 class Size;
 }
 
-namespace media {
-class VideoDecoderConfig;
-}
-
 namespace chromecast {
 namespace media {
 class DecoderBufferBase;
+class DecoderConfig;
 
 // VideoPipelineDevice -
 //
@@ -51,7 +48,7 @@ class VideoPipelineDevice : public MediaComponentDevice {
   // Must be called before switching from |kStateUninitialized| to |kStateIdle|.
   // Afterwards, this can be invoked any time the configuration changes.
   // Returns true if the configuration is a supported configuration.
-  virtual bool SetConfig(const ::media::VideoDecoderConfig& config) = 0;
+  virtual bool SetConfig(const DecoderConfig& config) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoPipelineDevice);