https://bugs.webkit.org/show_bug.cgi?id=91969

Reviewed by Hajime Morita.

Source/WebCore:

We add support for AuthorShadowDOM for progress element.

According to the Shadow DOM spec, a progress element should behave like having a UserAgentShadowRoot and
an element in UserAgentShadowRoot draws a real 'progress' bar. In this patch, we change the inner structure
of a progress element so that we can distribute an element having RenderProgress to AuthorShadowDOM.

Before this patch, a progress element has the following inner structure.

    <progress>--UserAgentShadowRoot -- -- -- -- -- -- -- -- -- -- AuthorShadowRoot
                       |
                       +-- ProgressBarElement
                       |
                       +-- ProgressValueElement

After this patch, a progress element will have the following inner structure.

    <progress>--UserAgentShadowRoot -- -- -- -- -- -- -- -- -- -- AuthorShadowRoot
                       |
                       +-- ProgressInnerElement
                                   |
                                   +-- ProgressBarElement
                                   |
                                   +-- ProgressValueElement

Tests: fast/dom/shadow/shadowdom-for-progress-dynamic.html
       fast/dom/shadow/shadowdom-for-progress-multiple.html
       fast/dom/shadow/shadowdom-for-progress-with-style.html
       fast/dom/shadow/shadowdom-for-progress-without-appearance.html
       fast/dom/shadow/shadowdom-for-progress-without-shadow-element.html
       fast/dom/shadow/shadowdom-for-progress.html

* css/html.css:
(progress::-webkit-progress-inner-element):
* html/HTMLProgressElement.cpp:
(WebCore::HTMLProgressElement::HTMLProgressElement):
(WebCore::HTMLProgressElement::createRenderer):
(WebCore::HTMLProgressElement::renderProgress): Returns RenderProgress gotten from UserAgentShadowDOM.
(WebCore):
(WebCore::HTMLProgressElement::willAddAuthorShadowRoot):
(WebCore::HTMLProgressElement::didElementStateChange):
(WebCore::HTMLProgressElement::createShadowSubtree): Creates a new Shadow DOM structure.
* html/HTMLProgressElement.h:
(WebCore):
(WebCore::HTMLProgressElement::hasAuthorShadowRoot):
(HTMLProgressElement):
(WebCore::isHTMLProgressElement):
(WebCore::toHTMLProgressElement):
* html/shadow/ProgressShadowElement.cpp:
(WebCore::ProgressShadowElement::ProgressShadowElement):
(WebCore::ProgressShadowElement::progressElement):
(WebCore::ProgressInnerElement::ProgressInnerElement): We introduce a new element having RenderProgress
so that we can distribute an element having RenderProgress to AuthorShadowDOM.
(WebCore):
(WebCore::ProgressInnerElement::create):
(WebCore::ProgressInnerElement::shadowPseudoId):
(WebCore::ProgressInnerElement::createRenderer):
(WebCore::ProgressInnerElement::rendererIsNeeded):
* html/shadow/ProgressShadowElement.h:
(ProgressShadowElement):
(WebCore):
(ProgressInnerElement):
* rendering/RenderProgress.cpp:
(WebCore::RenderProgress::RenderProgress):
(WebCore::RenderProgress::progressElement):
* rendering/RenderProgress.h:
(RenderProgress):

LayoutTests:

Contains the following tests:
  (1) progress element with AuthorShadowDOM
  (2) progress element with multiple AuthorShadowDOM with a shadow element
  (3) progress element with multiple AuthorShadowDOM without a shadow element
  (4) progress element with AuthorShadowDOM with dynamic value update
  (5) progress element with AuthorShadowDOM with style
  (6) progress element with AuthorShadowDOM with -webkit-appearance: none

* fast/dom/HTMLProgressElement/progress-clone-expected.txt:
* fast/dom/HTMLProgressElement/progress-clone.html:
* fast/dom/HTMLProgressElement/progress-element-markup-expected.txt:
* fast/dom/shadow/resources/replaced-element-styles.css: Added.
(.progress-like):
(.progress-inner-element-like):
* fast/dom/shadow/shadowdom-for-progress-dynamic-expected.html: Added.
* fast/dom/shadow/shadowdom-for-progress-dynamic.html: Added.
* fast/dom/shadow/shadowdom-for-progress-expected.html: Added.
* fast/dom/shadow/shadowdom-for-progress-multiple-expected.html: Added.
* fast/dom/shadow/shadowdom-for-progress-multiple.html: Added.
* fast/dom/shadow/shadowdom-for-progress-with-style-expected.html: Added.
* fast/dom/shadow/shadowdom-for-progress-with-style.html: Added.
* fast/dom/shadow/shadowdom-for-progress-without-appearance-expected.html: Added.
* fast/dom/shadow/shadowdom-for-progress-without-appearance.html: Added.
* fast/dom/shadow/shadowdom-for-progress-without-shadow-element-expected.html: Added.
* fast/dom/shadow/shadowdom-for-progress-without-shadow-element.html: Added.
* fast/dom/shadow/shadowdom-for-progress.html: Added.
* platform/chromium-win/fast/dom/HTMLProgressElement/indeterminate-progress-001-expected.txt:
* platform/chromium-win/fast/dom/HTMLProgressElement/progress-bar-value-pseudo-element-expected.txt:
* platform/chromium-win/fast/dom/HTMLProgressElement/progress-writing-mode-expected.txt:
* platform/mac/TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@124754 268f45cc-cd09-0410-ab3c-d52691b4dbfc