Cleanup resources allocated by FFmpeg to avoid memory and threads leaks...

media/base/mock_ffmpeg.cc

Index: media/base/mock_ffmpeg.cc
===================================================================
--- media/base/mock_ffmpeg.cc	(revision 19826)
+++ media/base/mock_ffmpeg.cc	(working copy)
@@ -57,6 +57,10 @@
   return media::MockFFmpeg::get()->AVCodecOpen(avctx, codec);
 }
 
+int avcodec_close(AVCodecContext* avctx) {
+  return media::MockFFmpeg::get()->AVCodecClose(avctx);
+}
+
 int avcodec_thread_init(AVCodecContext* avctx, int threads) {
   return media::MockFFmpeg::get()->AVCodecThreadInit(avctx, threads);
 }
@@ -83,6 +87,10 @@
                                                    parameters);
 }
 
+void av_close_input_file(AVFormatContext* format) {
+  media::MockFFmpeg::get()->AVCloseInputFile(format);
+}
+
 int av_find_stream_info(AVFormatContext* format) {
   return media::MockFFmpeg::get()->AVFindStreamInfo(format);
 }