support adaptive playback in MSE

media/base/android/media_decoder_job.h

Index: media/base/android/media_decoder_job.h
diff --git a/media/base/android/media_decoder_job.h b/media/base/android/media_decoder_job.h
index 01379f8fdca469f29c546a1a4d26cb2a89c5495f..433e035952971b62a61485e42313466d6532444f 100644
--- a/media/base/android/media_decoder_job.h
+++ b/media/base/android/media_decoder_job.h
@@ -78,7 +78,7 @@ class MediaDecoderJob {
   // Flushes the decoder and abandons all the data that is being decoded.
   virtual void Flush();
 
-  // Enter prerolling state. The job must not currently be decoding.
+  // Enters prerolling state. The job must not currently be decoding.
   void BeginPrerolling(base::TimeDelta preroll_timestamp);
 
   // Releases all the decoder resources as the current tab is going background.
@@ -229,9 +229,13 @@ class MediaDecoderJob {
   virtual bool AreDemuxerConfigsChanged(
       const DemuxerConfigs& configs) const = 0;
 
-  // Update the demuxer configs.
+  // Updates the demuxer configs.
   virtual void UpdateDemuxerConfigs(const DemuxerConfigs& configs) = 0;
 
+  // Returns true if |media_codec_bridge_| needs to be reconfigured for the
+  // new DemuxerConfigs, or false otherwise.
+  virtual bool IsCodecReconfigureNeeded(const DemuxerConfigs& configs) const;
+
   // Return the index to |received_data_| that is not currently being decoded.
   size_t inactive_demuxer_data_index() const {
     return 1 - current_demuxer_data_index_;