Split DragEvent back out from MouseEvent

tools/dom/scripts/htmleventgenerator.py

Index: tools/dom/scripts/htmleventgenerator.py
diff --git a/tools/dom/scripts/htmleventgenerator.py b/tools/dom/scripts/htmleventgenerator.py
index 2bf39b6a979022378ec84cd46f0135008f563673..c7a5d75ed7af667086584c00b58d028dd460a625 100644
--- a/tools/dom/scripts/htmleventgenerator.py
+++ b/tools/dom/scripts/htmleventgenerator.py
@@ -46,13 +46,13 @@ _html_event_types = monitored.Dict('htmleventgenerator._html_event_types', {
   '*.copy': ('copy', 'ClipboardEvent'),
   '*.cut': ('cut', 'ClipboardEvent'),
   '*.dblclick': ('doubleClick', 'Event'),
-  '*.drag': ('drag', 'MouseEvent'),
-  '*.dragend': ('dragEnd', 'MouseEvent'),
-  '*.dragenter': ('dragEnter', 'MouseEvent'),
-  '*.dragleave': ('dragLeave', 'MouseEvent'),
-  '*.dragover': ('dragOver', 'MouseEvent'),
-  '*.dragstart': ('dragStart', 'MouseEvent'),
-  '*.drop': ('drop', 'MouseEvent'),
+  '*.drag': ('drag', 'DragEvent'),
+  '*.dragend': ('dragEnd', 'DragEvent'),
+  '*.dragenter': ('dragEnter', 'DragEvent'),
+  '*.dragleave': ('dragLeave', 'DragEvent'),
+  '*.dragover': ('dragOver', 'DragEvent'),
+  '*.dragstart': ('dragStart', 'DragEvent'),
+  '*.drop': ('drop', 'DragEvent'),
   '*.durationchange': ('durationChange', 'Event'),
   '*.emptied': ('emptied', 'Event'),
   '*.ended': ('ended', 'Event'),