https://bugs.webkit.org/show_bug.cgi?id=82698

Reviewed by Ryosuke Niwa.

Source/WebCore:

The selection object returned from shadowRoot.selection should be able to see
the inner object of the shadowRoot.

In the previous code, the node out of the shadow subtree was returned for
anchorNode, focusNode, baseNode, and extentNode. This patch enables us to get
the corresponding shadow ancestor in the specified TreeScope (m_treeScope).

Tests: editing/shadow/selection-of-orphan-shadowroot.html
       editing/shadow/selection-of-shadowroot.html

* dom/ShadowRoot.cpp:
(WebCore::ShadowRoot::selection):
* dom/ShadowRoot.h:
(ShadowRoot):
* dom/TreeScope.cpp:
(WebCore::TreeScope::getSelection): When shadow DOM feature is not enabled, we want to use the same
instance of DOMSelection among Document and ShadowRoot.
* dom/TreeScopeAdjuster.cpp:
(WebCore::TreeScopeAdjuster::TreeScopeAdjuster):
(WebCore::TreeScopeAdjuster::ancestorInThisScope): Since node could be null, I've added a node check code.
* dom/TreeScopeAdjuster.h:
(TreeScopeAdjuster):
(WebCore::TreeScopeAdjuster::treeScope):
* page/DOMSelection.cpp:
(WebCore::DOMSelection::anchorNode):
(WebCore::DOMSelection::anchorOffset):
(WebCore::DOMSelection::focusNode):
(WebCore::DOMSelection::focusOffset):
(WebCore::DOMSelection::baseNode):
(WebCore::DOMSelection::baseOffset):
(WebCore::DOMSelection::extentNode):
(WebCore::DOMSelection::extentOffset):
(WebCore::DOMSelection::shadowAdjustedNode): Gets the corresponding node in the m_treeScope from the Position.
(WebCore):
(WebCore::DOMSelection::shadowAdjustedOffset): Gets the corresponding node offset in the m_treeScope from the Position.
* page/DOMSelection.h:
(WebCore):
(DOMSelection):

LayoutTests:

This patch contains 2 tests:
- Generates a complex HTML tree having a ShadowRoot, an older ShadowRoot, a nested ShadowRoot,
nested ShadowRoot in an older ShadowRoot, etc., and try to drag from a nested shadow root of
older shadow root to a nested shadow root of younger shadow root. Then checks nodes of Shadowroot.selection
are in the same tree scope or null.
- Generates a ShadowDOM which is not inserted into a document, and confirms nodes taken from
the selection are all null.

Also, this patch deprecates old shadowRoot.selection tests, because they test to check
window.getSelection() and shadowRoot.selection is the same. This behavior is changed by this patch.

* editing/shadow/selection-of-orphan-shadowroot-expected.txt: Added.
* editing/shadow/selection-of-orphan-shadowroot.html: Added.
* editing/shadow/selection-of-shadowroot-expected.txt: Added.
* editing/shadow/selection-of-shadowroot.html: Added.
* fast/dom/resources/event-sender-util.js:
(mouseMoveToElem):
(dragFromTo):
* fast/dom/shadow/resources/shadow-dom-util.js: Added.
(getElementByIdConsideringShadowDOM.iter):
(getElementByIdConsideringShadowDOM):
* fast/dom/shadow/selection-in-shadow.html: Removed.
* platform/chromium-mac-snowleopard/fast/dom/shadow/selection-in-shadow-expected.txt: Removed.
* platform/chromium/fast/dom/shadow/selection-in-shadow-expected.txt: Removed.
* platform/qt/Skipped:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117249 268f45cc-cd09-0410-ab3c-d52691b4dbfc