Add a function to convert key system into UUID

content/browser/android/media_player_manager_impl.cc

Index: content/browser/android/media_player_manager_impl.cc
diff --git a/content/browser/android/media_player_manager_impl.cc b/content/browser/android/media_player_manager_impl.cc
index 93c355a8a4a99a7956751bb6a5baa92208014feb..71c2d1c2b821c4f87bf7abb4e50fe35974cfddf1 100644
--- a/content/browser/android/media_player_manager_impl.cc
+++ b/content/browser/android/media_player_manager_impl.cc
@@ -486,6 +486,12 @@ void MediaPlayerManagerImpl::RemovePlayer(int player_id) {
   }
 }
 
+void MediaPlayerManagerImpl::AddDrmBridge(int media_keys_id,
+                                          const std::string& key_system) {
+  RemoveDrmBridge(media_keys_id);

[ddorwin, 2013/06/19 23:14:41]

Is that really something we want to do? Should we just assert it's not already
known? The actual MediaKeys object should not be reused. If |media_keys_id| is
the same as the media player ID, then we might reuse it. (In the new EME API,
they can't be the same as the two objects can live separately.)

[qinmin, 2013/06/20 00:49:26]

That's reassuring. I was wondering what could happen if a MediaKeys can be
reused. Changed this to a DCHECK().

On 2013/06/19 23:14:41, ddorwin wrote:

+  drm_bridges_.push_back(new MediaDrmBridge(media_keys_id, key_system));

[xhwang, 2013/06/19 22:04:04]

Not sure how this is connected to InitializeCDM(key_system) call. But we can
figure that out later.

+}
+
 void MediaPlayerManagerImpl::RemoveDrmBridge(int media_keys_id) {
   for (ScopedVector<MediaDrmBridge>::iterator it = drm_bridges_.begin();
       it != drm_bridges_.end(); ++it) {