[Blob] Dependencies for blob storage testing

public/platform/WebBlobData.h

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 50 matching lines @@
     BLINK_PLATFORM_EXPORT WebBlobData();
     BLINK_PLATFORM_EXPORT ~WebBlobData();
 
     bool isNull() const { return !m_private.get(); }
 
     // Returns the number of items.
     BLINK_PLATFORM_EXPORT size_t itemCount() const;
 
     // Retrieves the values of the item at the given index. Returns false if
     // index is out of bounds.
+    // This call is single use only per index. The memory ownership is
+    // transfered to the result in the case of memory items. A second call with
+    // the same index will result in null data.
+    // TODO(dmurph): change the name to 'takeItemAt'
     BLINK_PLATFORM_EXPORT bool itemAt(size_t index, Item& result) const;
 
     BLINK_PLATFORM_EXPORT WebString contentType() const;
 
 #if INSIDE_BLINK
     BLINK_PLATFORM_EXPORT WebBlobData(const WTF::PassOwnPtr<BlobData>&);
     BLINK_PLATFORM_EXPORT WebBlobData& operator=(const WTF::PassOwnPtr<BlobData>&);
     BLINK_PLATFORM_EXPORT operator WTF::PassOwnPtr<BlobData>();
 #endif
 
 private:
     WebPrivateOwnPtr<BlobData> m_private;
 };
 
 } // namespace blink
 
 #endif // WebBlobData_h