Have DataTransferItemList.add() methods return the added item

Source/core/platform/chromium/ChromiumDataObject.cpp

 /*
  * Copyright (c) 2008, 2009, 2012 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 72 matching lines @@
     if (index >= length())
         return;
     m_itemList.remove(index);
 }
 
 void ChromiumDataObject::clearAll()
 {
     m_itemList.clear();
 }
 
-void ChromiumDataObject::add(const String& data, const String& type, ExceptionState& es)
+PassRefPtr<ChromiumDataObjectItem> ChromiumDataObject::add(const String& data, const String& type, ExceptionState& es)
 {
-    if (!internalAddStringItem(ChromiumDataObjectItem::createFromString(type, data)))
+    RefPtr<ChromiumDataObjectItem> item = ChromiumDataObjectItem::createFromString(type, data);
+    if (!internalAddStringItem(item)) {
         es.throwDOMException(NotSupportedError);
+        return 0;
+    }
+    return item;
 }
 
-void ChromiumDataObject::add(PassRefPtr<File> file, ScriptExecutionContext* context)
+PassRefPtr<ChromiumDataObjectItem> ChromiumDataObject::add(PassRefPtr<File> file, ScriptExecutionContext* context)
 {
     if (!file)
-        return;
+        return 0;
 
-    m_itemList.append(ChromiumDataObjectItem::createFromFile(file));
+    RefPtr<ChromiumDataObjectItem> item = ChromiumDataObjectItem::createFromFile(file);
+    m_itemList.append(item);
+    return item;
 }
 
 void ChromiumDataObject::clearData(const String& type)
 {
     for (size_t i = 0; i < m_itemList.size(); ++i) {
         if (m_itemList[i]->kind() == DataTransferItem::kindString && m_itemList[i]->type() == type) {
             // Per the spec, type must be unique among all items of kind 'string'.
             m_itemList.remove(i);
             return;
         }
@@ skipping 134 matching lines @@
     return true;
 }
 
 void ChromiumDataObject::internalAddFileItem(PassRefPtr<ChromiumDataObjectItem> item)
 {
     ASSERT(item->kind() == DataTransferItem::kindFile);
     m_itemList.append(item);
 }
 
 } // namespace WebCore