Support multiple HRTFDatabases for different sample-rates

Source/modules/webaudio/OfflineAudioDestinationNode.cpp

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 98 matching lines @@
     if (!channelsMatch)
         return;
         
     bool isRenderBusAllocated = m_renderBus->length() >= renderQuantumSize;
     ASSERT(isRenderBusAllocated);
     if (!isRenderBusAllocated)
         return;
         
     // Synchronize with HRTFDatabaseLoader.
     // The database must be loaded before we can proceed.
-    HRTFDatabaseLoader* loader = HRTFDatabaseLoader::loader();
+    HRTFDatabaseLoader* loader = context()->hrtfDatabaseLoader();
     ASSERT(loader);
     if (!loader)
         return;
     
     loader->waitForLoaderThreadCompletion();
         
     // Break up the render target into smaller "render quantize" sized pieces.
     // Render until we're finished.
     size_t framesToProcess = m_renderTarget->length();
     unsigned numberOfChannels = m_renderTarget->numberOfChannels();
@@ skipping 31 matching lines @@
 }
 
 void OfflineAudioDestinationNode::notifyComplete()
 {
     context()->fireCompletionEvent();
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)