media: Update logging to indicate that new key has been provided

media/filters/decrypting_audio_decoder.cc

Index: media/filters/decrypting_audio_decoder.cc
diff --git a/media/filters/decrypting_audio_decoder.cc b/media/filters/decrypting_audio_decoder.cc
index 045047fdd544870c39a96e0f7d75dddd53ad1a3e..6ae354c47b3cd9b999a61c329a3169451e7943e0 100644
--- a/media/filters/decrypting_audio_decoder.cc
+++ b/media/filters/decrypting_audio_decoder.cc
@@ -278,6 +278,8 @@ void DecryptingAudioDecoder::DeliverFrame(
 
     if (need_to_try_again_if_nokey_is_returned) {
       // The |state_| is still kPendingDecode.
+      MEDIA_LOG(INFO, media_log_) << GetDisplayName()
+                                  << ": key was added, resuming decode";
       DecodePendingBuffer();
       return;
     }
@@ -320,6 +322,8 @@ void DecryptingAudioDecoder::OnKeyAdded() {
   }
 
   if (state_ == kWaitingForKey) {
+    MEDIA_LOG(INFO, media_log_) << GetDisplayName()
+                                << ": key added, resuming decode";
     state_ = kPendingDecode;
     DecodePendingBuffer();
   }