[InputEvent] Support |deleteByDrag| and |insertFromDrop|

third_party/WebKit/Source/core/events/InputEvent.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef InputEvent_h
 #define InputEvent_h
 
 #include "core/clipboard/DataTransfer.h"
 #include "core/dom/StaticRange.h"
 #include "core/events/InputEventInit.h"
@@ skipping 14 matching lines @@
         None,
         // Insertion.
         InsertText,
         InsertNonText,
         InsertLineBreak,
         InsertParagraph,
         InsertOrderedList,
         InsertUnorderedList,
         InsertHorizontalRule,
         InsertFromPaste,
+        InsertFromDrop,
         // Deletion.
         DeleteComposedCharacterForward,
         DeleteComposedCharacterBackward,
         DeleteWordBackward,
         DeleteWordForward,
         DeleteLineBackward,
         DeleteLineForward,
         DeleteContentBackward,
         DeleteContentForward,
         DeleteByCut,
+        DeleteByDrag,
         // Command.
         Undo,
         Redo,
         // Styling.
         Bold,
         Italic,
         Underline,
         StrikeThrough,
         Superscript,
         Subscript,
         // Formatting.
         JustifyCenter,
         JustifyRight,
         JustifyLeft,
         Indent,
         Outdent,
         RemoveFormat,
         // Not on spec.
-        // TODO(chongz): Drag is not on SPEC but it's not decided how we should handle it.
-        Drag,
         JustifyFull,
         SetColor,
         SetBackgroundColor,
         SetFont,
         ChangeAttributes,
         SetWritingDirection,
         Unscript,
         CreateLink,
         Unlink,
         FormatBlock,
+        // Internal use.
+        MoveByDragDrop, // Combines |InsertFromDrop| and |DeleteByDrag|.
 
         // Add new input types immediately above this line.
         NumberOfInputTypes,
     };
 
     enum EventCancelable : bool {
         NotCancelable = false,
         IsCancelable = true,
     };
 
@@ skipping 41 matching lines @@
     explicit InputEventDispatchMediator(InputEvent*);
     InputEvent& event() const;
     DispatchEventResult dispatchEvent(EventDispatcher&) const override;
 };
 
 DEFINE_EVENT_TYPE_CASTS(InputEvent);
 
 } // namespace blink
 
 #endif // InputEvent_h