Only generate suggested filenames when actually dragging an image.

third_party/WebKit/Source/core/clipboard/DataObject.h

 /*
  * Copyright (c) 2008, 2009, 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 85 matching lines @@
   // Used for dragging in filesystem from the desktop.
   void setFilesystemId(const String& fileSystemId) {
     m_filesystemId = fileSystemId;
   }
   const String& filesystemId() const {
     ASSERT(!m_filesystemId.isEmpty());
     return m_filesystemId;
   }
 
   // Used to handle files (images) being dragged out.
-  void addSharedBuffer(const String& name, PassRefPtr<SharedBuffer>);
+  void addSharedBuffer(PassRefPtr<SharedBuffer>,
+                       const KURL&,
+                       const String& filenameExtension,
+                       const AtomicString& contentDisposition);
 
   int modifiers() const { return m_modifiers; }
   void setModifiers(int modifiers) { m_modifiers = modifiers; }
 
   DECLARE_TRACE();
 
   WebDragData toWebDragData();
 
  private:
   DataObject();
 
   DataObjectItem* findStringItem(const String& type) const;
   bool internalAddStringItem(DataObjectItem*);
   void internalAddFileItem(DataObjectItem*);
 
   HeapVector<Member<DataObjectItem>> m_itemList;
 
   // State of Shift/Ctrl/Alt/Meta keys and Left/Right/Middle mouse buttons
   int m_modifiers;
   String m_filesystemId;
 };
 
 }  // namespace blink
 
 #endif