Call NotifyDemuxerReady() only once while keys are added.

webkit/renderer/media/android/webmediaplayer_android.cc

Index: webkit/renderer/media/android/webmediaplayer_android.cc
diff --git a/webkit/renderer/media/android/webmediaplayer_android.cc b/webkit/renderer/media/android/webmediaplayer_android.cc
index 6ffde4c9a3b17f0e6cd6174011273546ca9ef924..4bdfdd4a0e7a58e18113e4900e14ee60be837c0a 100644
--- a/webkit/renderer/media/android/webmediaplayer_android.cc
+++ b/webkit/renderer/media/android/webmediaplayer_android.cc
@@ -1036,7 +1036,8 @@ void WebMediaPlayerAndroid::OnKeyAdded(const std::string& session_id) {
   EmeUMAHistogramCounts(current_key_system_.utf8(), "KeyAdded", 1);
 
   if (media_source_delegate_)
-    media_source_delegate_->NotifyDemuxerReady(current_key_system_.utf8());
+    media_source_delegate_->NotifyKeyAdded(
+        current_key_system_.utf8(), session_id);

[xhwang, 2013/06/20 17:30:50]

Why is MSD interested in what key system it is?

[kjyoun, 2013/06/21 00:05:39]

MSD needs to know key_system in order to pass it to demuxer_stream_player, 
which pass this info to platform's video path.

FYI, key_system and other crypto-related info is wrapped in
MediaPlayerHostMsg_DemuxerReady_Params 
On 2013/06/20 17:30:50, xhwang wrote:

 
   client_->keyAdded(current_key_system_, WebString::fromUTF8(session_id));
 }