Fixes release build

sky/engine/platform/image-decoders/ImageDecoder.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) Research In Motion Limited 2009-2010. 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
@@ skipping 18 matching lines @@
 
 #include "SkColorPriv.h"
 #include "platform/PlatformExport.h"
 #include "platform/PlatformScreen.h"
 #include "platform/SharedBuffer.h"
 #include "platform/graphics/ImageSource.h"
 #include "platform/image-decoders/ImageFrame.h"
 #include "public/platform/Platform.h"
 #include "wtf/Assertions.h"
 #include "wtf/RefPtr.h"
+#include "wtf/Threading.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 #if USE(QCMSLIB)
 #include "qcms.h"
 #if OS(MACOSX)
 #include <ApplicationServices/ApplicationServices.h>
 #include "wtf/RetainPtr.h"
 #endif
 #endif
@@ skipping 274 matching lines @@
 
     IntSize m_size;
     bool m_sizeAvailable;
     bool m_isAllDataReceived;
     bool m_failed;
 };
 
 } // namespace blink
 
 #endif