Use tighter typing in editing: CompositeEditCommand

Source/core/editing/htmlediting.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 782 matching lines @@
     case EditorParagraphSeparatorIsDiv:
         return HTMLDivElement::create(document);
     case EditorParagraphSeparatorIsP:
         return HTMLParagraphElement::create(document);
     }
 
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
-PassRefPtrWillBeRawPtr<HTMLElement> createBreakElement(Document& document)
+PassRefPtrWillBeRawPtr<HTMLBRElement> createBreakElement(Document& document)
 {
     return HTMLBRElement::create(document);
 }
 
 PassRefPtrWillBeRawPtr<HTMLElement> createOrderedListElement(Document& document)
 {
     return HTMLOListElement::create(document);
 }
 
 PassRefPtrWillBeRawPtr<HTMLElement> createUnorderedListElement(Document& document)
@@ skipping 55 matching lines @@
 PassRefPtrWillBeRawPtr<HTMLSpanElement> createTabSpanElement(Document& document, const String& tabText)
 {
     return createTabSpanElement(document, document.createTextNode(tabText));
 }
 
 PassRefPtrWillBeRawPtr<HTMLSpanElement> createTabSpanElement(Document& document)
 {
     return createTabSpanElement(document, PassRefPtrWillBeRawPtr<Text>(nullptr));
 }
 
+PassRefPtrWillBeRawPtr<HTMLBRElement> createBlockPlaceholderElement(Document& document)
+{
+    return toHTMLBRElement(document.createElement(brTag, false).get());
+}
+
 bool isNodeRendered(const Node *node)
 {
     if (!node)
         return false;
 
     RenderObject* renderer = node->renderer();
     if (!renderer)
         return false;
 
     return renderer->style()->visibility() == VISIBLE;
@@ skipping 302 matching lines @@
     // if the selection starts just before a paragraph break, skip over it
     if (isEndOfParagraph(visiblePosition))
         return visiblePosition.next().deepEquivalent().downstream();
 
     // otherwise, make sure to be at the start of the first selected node,
     // instead of possibly at the end of the last node before the selection
     return visiblePosition.deepEquivalent().downstream();
 }
 
 } // namespace blink