https://bugs.webkit.org/show_bug.cgi?id=105839

Reviewed by Pavel Feldman.

In addition to the plumbing which allows template contents to be
displayed within the inspector, this patch adds a manually-managed
weakref from the template document back to its host document (typically
the creator). This is required so that the inspector agent can be found
for template elements.

* dom/Document.cpp:
(WebCore::Document::~Document):
(WebCore::Document::templateDocument):
* dom/Document.h:
(Document):
(WebCore::Document::setTemplateDocumentHost):
(WebCore::Document::templateDocumentHost):
* editing/markup.cpp:
(WebCore::createFragmentForInnerOuterHTML):
* html/HTMLTemplateElement.cpp:
(WebCore::HTMLTemplateElement::content):
* inspector/Inspector.json:
* inspector/InspectorDOMAgent.cpp:
(WebCore::InspectorDOMAgent::buildObjectForNode):
* inspector/InspectorInstrumentation.h:
(WebCore::InspectorInstrumentation::instrumentingAgentsForDocument):
* inspector/front-end/DOMAgent.js:
(WebInspector.DOMNode):
(WebInspector.DOMNode.prototype.hasChildNodes):
(WebInspector.DOMNode.prototype._insertChild):
(WebInspector.DOMNode.prototype._setChildrenPayload):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139132 268f45cc-cd09-0410-ab3c-d52691b4dbfc