Prohibit having AuthorShadowDOM of input or textarea element for a while and having a flag to enable it in Internals.
https://bugs.webkit.org/show_bug.cgi?id=92611

Reviewed by Hajime Morita.

.:

* Source/autotools/symbols.filter:

Source/WebCore:

Prohibit having AuthorShadowDOM of input elemnet unless a flag in RuntimeEnabledFeatures is not enabled.
The flag can be enabled in Internals.

The elements in UserAgentShadowDOM of input element assume that they have a renderer when the input
element has a renderer. However, this does not hold when AuthorShadowDOM is added to input element.
So until we fix the issue, we should disable to have AuthorShadowDOM for input element, because it may
cause crashes and security problems.

Tests: fast/dom/shadow/input-with-validation-without-shadow.html
       fast/dom/shadow/input-with-validation.html
       fast/dom/shadow/shadow-disable.html

* bindings/generic/RuntimeEnabledFeatures.cpp:
(WebCore):
* bindings/generic/RuntimeEnabledFeatures.h:
(RuntimeEnabledFeatures):
(WebCore::RuntimeEnabledFeatures::authorShadowDOMForAnyElementEnabled):
(WebCore::RuntimeEnabledFeatures::setAuthorShadowDOMForAnyElementEnabled):
* dom/ShadowRoot.cpp:
(WebCore::allowsAuthorShadowRoot): The input element or textarea element does not allow to have a ShadowDOM unless
is a flag in RuntimeEnabledFeatures is not enabled.
* html/HTMLInputElement.h:
(WebCore::isHTMLInputElement):
(WebCore):
* html/HTMLTextAreaElement.h:
(WebCore::isHTMLTextAreaElement):
(WebCore):
* testing/Internals.cpp:
(WebCore::Internals::setAuthorShadowDOMForAnyElementEnabled):
(WebCore):
* testing/Internals.h:
(Internals):
* testing/Internals.idl:

LayoutTests:

* fast/dom/shadow/input-with-validation-without-shadow.html: Make the test runs even if
new WebKitShadowRoot() throws an exception.
* fast/dom/shadow/input-with-validation.html: Sets a flag to make AuthorShadowDOM available.
* fast/dom/shadow/shadow-disable-expected.txt:
* fast/dom/shadow/shadow-disable.html: Makes it unavailable for input and textarea to have an AuthorShadowDOM.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@124027 268f45cc-cd09-0410-ab3c-d52691b4dbfc