Merge 94984 - Address lifetime issues in OfflineAudioDestinationNode

Source/WebCore/webaudio/OfflineAudioDestinationNode.cpp

Index: Source/WebCore/webaudio/OfflineAudioDestinationNode.cpp
===================================================================
--- Source/WebCore/webaudio/OfflineAudioDestinationNode.cpp	(revision 96041)
+++ Source/WebCore/webaudio/OfflineAudioDestinationNode.cpp	(working copy)
@@ -53,6 +53,9 @@
 
 OfflineAudioDestinationNode::~OfflineAudioDestinationNode()
 {
+    if (m_renderThread)
+        waitForThreadCompletion(m_renderThread, 0);
+    
     uninitialize();
 }
 
@@ -145,6 +148,8 @@
     }
     
     // Our work is done. Let the AudioContext know.
+    // See corresponding deref() call in notifyCompleteDispatch().
+    ref();
     callOnMainThread(notifyCompleteDispatch, this);
 }