Create media.dll / libmedia.so for the component build

media/base/video_decoder_config.h

Index: media/base/video_decoder_config.h
===================================================================
--- media/base/video_decoder_config.h	(revision 95116)
+++ media/base/video_decoder_config.h	(working copy)
@@ -7,6 +7,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
+#include "media/base/media_export.h"
 
 namespace media {
 
@@ -25,7 +26,7 @@
   // that uses said codec in the same CL.
 };
 
-class VideoDecoderConfig {
+class MEDIA_EXPORT VideoDecoderConfig {
  public:
   VideoDecoderConfig(VideoCodec codec, int width, int height,
                      int surface_width, int surface_height,