cloneNode(true) does not clone nested template elements' contents

cloneNode(true) does not clone nested template elements' contents
https://bugs.webkit.org/show_bug.cgi?id=137755

Reviewed by Darin Adler.

Source/WebCore:

The bug was caused by cloneChildNodes not copying template element's content.

Fixed the bug by adding the third behavior (CloneContent) to the polymorphic
cloneNodeInternal, which copies template element's content but not its children,
in addition to the existing CloneSelf (deep=false) and CloneChildren (deep=true).

Test: fast/dom/HTMLTemplateElement/cloneNode-nested-templates.html

* dom/Attr.cpp:
(WebCore::Attr::cloneNodeInternal): Renamed from cloneNode.
* dom/Attr.h:
* dom/CDATASection.cpp:
(WebCore::CDATASection::cloneNodeInternal): Renamed from cloneNode.
* dom/CDATASection.h:
* dom/Comment.cpp:
(WebCore::Comment::cloneNodeInternal): Renamed from cloneNode.
* dom/Comment.h:
* dom/ContainerNode.cpp:
(WebCore::ContainerNode::cloneChildNodes): Calls cloneNode with CloneContent.
* dom/Document.cpp:
(WebCore::Document::cloneNodeInternal): Renamed from cloneNode.
* dom/Document.h:
* dom/DocumentFragment.cpp:
(WebCore::DocumentFragment::cloneNodeInternal): Renamed from cloneNode.
* dom/DocumentFragment.h:
* dom/DocumentType.cpp:
(WebCore::DocumentType::cloneNodeInternal): Renamed from cloneNode.
* dom/DocumentType.h:
* dom/Element.cpp:
(WebCore::Element::cloneNodeInternal): Renamed from cloneNode.
* dom/Element.h:
* dom/EntityReference.cpp:
(WebCore::EntityReference::cloneNodeInternal): Renamed from cloneNode.
* dom/EntityReference.h:
* dom/Node.h:
(WebCore::Node::cloneNode): Added. It calls cloneNodeInternal with CloneSelf or CloneChildren.
* dom/ProcessingInstruction.cpp:
(WebCore::ProcessingInstruction::cloneNodeInternal): Renamed from cloneNode.
* dom/ProcessingInstruction.h:
* dom/ShadowRoot.cpp:
(WebCore::ShadowRoot::cloneNodeInternal): Renamed from cloneNode. Also moved from ShadowRoot.h.
* dom/ShadowRoot.h:
* dom/Text.cpp:
(WebCore::Text::cloneNodeInternal): Renamed from cloneNode.
* dom/Text.h:
* html/HTMLTemplateElement.cpp:
(WebCore::HTMLTemplateElement::cloneNodeInternal): Renamed from cloneNode. This is the only
function in which CloneContent results in a different behavior from CloneSelf.
* html/HTMLTemplateElement.h:

LayoutTests:

Added a regression test.

* fast/dom/HTMLTemplateElement/cloneNode-nested-templates-expected.txt: Added.
* fast/dom/HTMLTemplateElement/cloneNode-nested-templates.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@177314 268f45cc-cd09-0410-ab3c-d52691b4dbfc