Changes to allow testing interface for new NaCl Proxy

ppapi/proxy/ppb_audio_proxy.cc

Index: ppapi/proxy/ppb_audio_proxy.cc
===================================================================
--- ppapi/proxy/ppb_audio_proxy.cc	(revision 157652)
+++ ppapi/proxy/ppb_audio_proxy.cc	(working copy)
@@ -74,6 +74,13 @@
 }
 
 Audio::~Audio() {
+#if defined(OS_NACL)
+  // Invoke StopPlayback() to ensure audio back-end has a chance to send the
+  // escape value over the sync socket, which will terminate the client side
+  // audio callback loop.  This is required for NaCl Plugins that can't escape
+  // by shutting down the sync_socket.
+  StopPlayback();
+#endif
   PpapiGlobals::Get()->GetResourceTracker()->ReleaseResource(config_);
 }