[InputEvent] Support |deleteByDrag| and |insertFromDrop|

third_party/WebKit/Source/core/editing/EditingUtilities.cpp

 /*
  * Copyright (C) 2004, 2005, 2006, 2007 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1845 matching lines @@
 {
     return node && node->layoutObject() && node->layoutObject()->style()->textSecurity() != TSNONE;
 }
 
 DispatchEventResult dispatchBeforeInputInsertText(EventTarget* target, const String& data)
 {
     if (!RuntimeEnabledFeatures::inputEventEnabled())
         return DispatchEventResult::NotCanceled;
     if (!target)
         return DispatchEventResult::NotCanceled;
-    // TODO(chongz): Pass appreciate |ranges| after it's defined on spec.
-    // http://w3c.github.io/editing/input-events.html#dom-inputevent-inputtype
     InputEvent* beforeInputEvent = InputEvent::createBeforeInput(InputEvent::InputType::InsertText, data, InputEvent::EventCancelable::IsCancelable, InputEvent::EventIsComposing::NotComposing, nullptr);
     return target->dispatchEvent(beforeInputEvent);
 }
 
 DispatchEventResult dispatchBeforeInputFromComposition(EventTarget* target, InputEvent::InputType inputType, const String& data, InputEvent::EventCancelable cancelable)
 {
     if (!RuntimeEnabledFeatures::inputEventEnabled())
         return DispatchEventResult::NotCanceled;
     if (!target)
         return DispatchEventResult::NotCanceled;
-    // TODO(chongz): Pass appreciate |ranges| after it's defined on spec.
+    // TODO(chongz): Pass appreciate |ranges| after it's defined on spec. e.g. For |DeleteComposedCharacterBackward|.
     // http://w3c.github.io/editing/input-events.html#dom-inputevent-inputtype
     InputEvent* beforeInputEvent = InputEvent::createBeforeInput(inputType, data, cancelable, InputEvent::EventIsComposing::IsComposing, nullptr);
     return target->dispatchEvent(beforeInputEvent);
 }
 
 DispatchEventResult dispatchBeforeInputEditorCommand(EventTarget* target, InputEvent::InputType inputType, const String& data, const RangeVector* ranges)
 {
     if (!RuntimeEnabledFeatures::inputEventEnabled())
         return DispatchEventResult::NotCanceled;
     if (!target)
@@ skipping 27 matching lines @@
             return InputType::DeleteWordBackward;
         if (granularity == LineBoundary)
             return InputType::DeleteLineBackward;
         return InputType::DeleteContentBackward;
     default:
         return InputType::None;
     }
 }
 
 } // namespace blink