https://bugs.webkit.org/show_bug.cgi?id=90532

Reviewed by Hajime Morita.

Source/WebCore:

This patch adds Shadow DOM support for img element.

According to the Shadow DOM spec, img element should behave like having a user agent Shadow DOM.
However, if we add Shadow DOM to img by default, it will cause performance regression and memory bloat.

So, we would like to postpone adding a Shadow DOM to img until when we really need it. In other words,
we add our User Agent Shadow DOM to img just before a user adds Author Shadow DOM.

The User Agent Shadow DOM for img has only one element, which displays an image. If img has
a Shadow DOM, img will behave like <span style="display: inline-block"> by default. The display style can
be chagned using CSS though.

This patch also adds ImageLoaderClient. The element we render an image and the element we take an argument
from were the same, however not they might be different. We would like to encapsulate the fact into
ImageLoaderClient.

Tests: fast/dom/shadow/shadowdom-for-image-alt-update.html
       fast/dom/shadow/shadowdom-for-image-alt.html
       fast/dom/shadow/shadowdom-for-image-content.html
       fast/dom/shadow/shadowdom-for-image-dynamic.html
       fast/dom/shadow/shadowdom-for-image-event-click.html
       fast/dom/shadow/shadowdom-for-image-in-shadowdom.html
       fast/dom/shadow/shadowdom-for-image-map.html
       fast/dom/shadow/shadowdom-for-image-style.html
       fast/dom/shadow/shadowdom-for-image-with-multiple-shadow.html
       fast/dom/shadow/shadowdom-for-image-with-width-and-height.html
       fast/dom/shadow/shadowdom-for-image.html

* CMakeLists.txt:
* GNUmakefile.list.am:
* Target.pri:
* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.xcodeproj/project.pbxproj:
* css/html.css:
(img):
* html/HTMLImageElement.cpp:
(WebCore::ImageElement::setImageIfNecessary):
(WebCore):
(WebCore::ImageElement::createRendererForImage):
(WebCore::HTMLImageElement::willAddAuthorShadowRoot): When we don't have a user agent Shadow DOM yet
we add it.
(WebCore::HTMLImageElement::createShadowSubtree):
(WebCore::HTMLImageElement::imageElement):
(WebCore::HTMLImageElement::parseAttribute):
(WebCore::HTMLImageElement::createRenderer): If a user agent Shadow DOM is attached, we create
Renderer from style, instead of creating RenderImage.
(WebCore::HTMLImageElement::attach):
(WebCore::HTMLImageElement::innerElement):
* html/HTMLImageElement.h:
(WebCore):
(ImageElement):
(HTMLImageElement):
(WebCore::HTMLImageElement::sourceElement):
(WebCore::HTMLImageElement::refSourceElement):
(WebCore::HTMLImageElement::derefSourceElement):
(WebCore::HTMLImageElement::imageRenderer):
(WebCore::HTMLImageElement::imageLoader):
(WebCore::isHTMLImageElement):
(WebCore::toHTMLImageElement):
* html/HTMLImageLoader.cpp:
(WebCore::HTMLImageLoader::HTMLImageLoader):
(WebCore::HTMLImageLoader::dispatchLoadEvent):
(WebCore::HTMLImageLoader::sourceURI):
(WebCore::HTMLImageLoader::notifyFinished):
* html/HTMLImageLoader.h:
(HTMLImageLoader):
* html/HTMLInputElement.h:
* html/HTMLObjectElement.h:
* html/HTMLPlugInElement.h:
* html/HTMLTagNames.in:
* html/HTMLVideoElement.h:
* html/shadow/ImageInnerElement.cpp: Added.
(WebCore):
(WebCore::ImageInnerElement::ImageInnerElement):
(WebCore::ImageInnerElement::hostImage):
(WebCore::ImageInnerElement::imageLoader):
(WebCore::ImageInnerElement::attach):
(WebCore::ImageInnerElement::createRenderer):
* html/shadow/ImageInnerElement.h: Added.
(WebCore):
(ImageInnerElement):
(WebCore::ImageInnerElement::imageRenderer):
(WebCore::ImageInnerElement::create):
(WebCore::isImageInnerElement):
(WebCore::toImageInnerElement):
* loader/ImageLoader.cpp:
(WebCore::ImageLoader::ImageLoader):
(WebCore::ImageLoader::~ImageLoader):
(WebCore):
(WebCore::ImageLoader::document):
(WebCore::ImageLoader::updateFromElement):
(WebCore::ImageLoader::notifyFinished):
(WebCore::ImageLoader::renderImageResource):
(WebCore::ImageLoader::updatedHasPendingLoadEvent):
(WebCore::ImageLoader::dispatchPendingBeforeLoadEvent):
(WebCore::ImageLoader::dispatchPendingLoadEvent):
(WebCore::ImageLoader::dispatchPendingErrorEvent):
* loader/ImageLoader.h:
(WebCore):
(ImageLoader):
(WebCore::ImageLoader::client):
* loader/ImageLoaderClient.h: Added.
(WebCore):
(ImageLoaderClient): Provides the necessary interfaces to ImageLoader.
(WebCore::ImageLoaderClient::~ImageLoaderClient):
(ImageLoaderClientBase):
(WebCore::ImageLoaderClientBase::sourceElement):
(WebCore::ImageLoaderClientBase::imageElement):
(WebCore::ImageLoaderClientBase::refSourceElement):
(WebCore::ImageLoaderClientBase::derefSourceElement):
* rendering/RenderImage.cpp:
(WebCore::RenderImage::paintIntoRect):
(WebCore::RenderImage::imageMap):
(WebCore::RenderImage::updateAltText):
(WebCore::RenderImage::hostImageElement):
(WebCore):
* rendering/RenderImage.h:
(WebCore):
(RenderImage):
* rendering/RenderObject.cpp:
(WebCore::RenderObject::shouldRespectImageOrientation):
* svg/SVGImageElement.h:
(SVGImageElement):
* svg/SVGImageLoader.cpp:
(WebCore::SVGImageLoader::SVGImageLoader):
(WebCore::SVGImageLoader::dispatchLoadEvent):
(WebCore::SVGImageLoader::sourceURI):
* svg/SVGImageLoader.h:
(SVGImageLoader):

LayoutTests:

Contains the following test cases.
(1) ShadowDOM is attached to an img element and use a shadow element
(2) ShadowDOM is attached to an img element and use a content element
(3) width and height are specified
(4) src attribute is dynamically changed
(5) multiple ShadowDOMs are attached to an img element
(6) ShadowDOM is attached to an img element in Shadow DOM
(7) event retargetting
(8) img with display: none, display: inline, display: block
(9) image map
(10) alt text
(11) alt text with dynamic update

* fast/dom/shadow/shadowdom-for-image-alt-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-alt-update-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-alt-update.html: Added.
* fast/dom/shadow/shadowdom-for-image-alt.html: Added.
* fast/dom/shadow/shadowdom-for-image-content-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-content.html: Added.
* fast/dom/shadow/shadowdom-for-image-dynamic-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-dynamic.html: Added.
* fast/dom/shadow/shadowdom-for-image-event-click-expected.txt: Added.
* fast/dom/shadow/shadowdom-for-image-event-click.html: Added.
* fast/dom/shadow/shadowdom-for-image-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-in-shadowdom-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-in-shadowdom.html: Added.
* fast/dom/shadow/shadowdom-for-image-map-expected.txt: Added.
* fast/dom/shadow/shadowdom-for-image-map.html: Added.
* fast/dom/shadow/shadowdom-for-image-style-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-style.html: Added.
* fast/dom/shadow/shadowdom-for-image-with-multiple-shadow-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-with-multiple-shadow.html: Added.
* fast/dom/shadow/shadowdom-for-image-with-width-and-height-expected.html: Added.
* fast/dom/shadow/shadowdom-for-image-with-width-and-height.html: Added.
* fast/dom/shadow/shadowdom-for-image.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@122824 268f45cc-cd09-0410-ab3c-d52691b4dbfc