media: Hook up ContentDecryptionModuleClient in mojo CDM service.

media/mojo/services/mojo_cdm.cc

Index: media/mojo/services/mojo_cdm.cc
diff --git a/media/mojo/services/mojo_cdm.cc b/media/mojo/services/mojo_cdm.cc
index 43dbf2d7a14daba3ba7f34877fb8908d5667183e..d228f7347d1b71eb0efb335a4313d9710e55b8e6 100644
--- a/media/mojo/services/mojo_cdm.cc
+++ b/media/mojo/services/mojo_cdm.cc
@@ -39,6 +39,7 @@ MojoCdm::MojoCdm(mojo::ContentDecryptionModulePtr remote_cdm,
                  const SessionKeysChangeCB& session_keys_change_cb,
                  const SessionExpirationUpdateCB& session_expiration_update_cb)
     : remote_cdm_(remote_cdm.Pass()),
+      binding_(this),
       session_message_cb_(session_message_cb),
       session_closed_cb_(session_closed_cb),
       session_error_cb_(session_error_cb),
@@ -52,9 +53,9 @@ MojoCdm::MojoCdm(mojo::ContentDecryptionModulePtr remote_cdm,
   DCHECK(!session_keys_change_cb_.is_null());
   DCHECK(!session_expiration_update_cb_.is_null());
 
-  // TODO(xhwang): Client syntax has been removed, so a new mechanism for client
-  // discovery must be added to this interface.  See http://crbug.com/451321.
-  NOTREACHED();
+  mojo::ContentDecryptionModuleClientPtr client_ptr;
+  binding_.Bind(GetProxy(&client_ptr));
+  remote_cdm_->SetClient(client_ptr.Pass());

[xhwang, 2015/03/17 23:30:37]

We don't need to wait for a confirmation callaback because all commands are
queued up in the pipe. Before the next command/call is handled, we must have
finished processing SetClient() on the service side.

 }
 
 MojoCdm::~MojoCdm() {