EME: Handle NO_KEY and resume playback after key is added.

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 661f4620c913d298817042bfcdfb73b17a0c0cb2..e54080efa7771dd585bc8535667e1da21e240cba 100644
--- a/media/base/android/media_decoder_job.h
+++ b/media/base/android/media_decoder_job.h
@@ -151,6 +151,10 @@ class MediaDecoderJob {
   // Data received over IPC from last RequestData() operation.
   DemuxerData received_data_;
 
+  // The index of input buffer that can be used by QueueInputBuffer().
+  // If the index is uninitialized or invalid, it must be -1.
+  int input_buf_index_;
+
   bool stop_decode_pending_;
 
   // Indicates that this object should be destroyed once the current