Add a CF-style base type (WKTypeRef) as a base for polymorphic functions.

Reviewed by Darin Adler.

- Add first polymorphic function, WKGetTypeID.
- Add functions to each WK type to get their respective TypeIDs.
- Adds WebURL to complement WebString.

* Shared/APIObject.h:
(WebKit::APIObject::):
(WebKit::APIObject::~APIObject):
* Shared/ImmutableArray.h:
(WebKit::ImmutableArray::type):
* Shared/WebString.h:
(WebKit::WebString::type):
* Shared/WebURL.h: Added.
(WebKit::WebURL::create):
(WebKit::WebURL::type):
(WebKit::WebURL::isNull):
(WebKit::WebURL::isEmpty):
(WebKit::WebURL::string):
(WebKit::WebURL::WebURL):
* UIProcess/API/C/WKAPICast.h:
(WebKit::ProxyingRefPtr::ProxyingRefPtr):
(WebKit::ProxyingRefPtr::operator APIType):
(toRef):
(toURLRef):
(toCopiedURLRef):
* UIProcess/API/C/WKArray.cpp:
(WKArrayGetTypeID):
* UIProcess/API/C/WKArray.h:
* UIProcess/API/C/WKBackForwardList.cpp:
(WKBackForwardListGetTypeID):
* UIProcess/API/C/WKBackForwardList.h:
* UIProcess/API/C/WKBackForwardListItem.cpp:
(WKBackForwardListItemGetTypeID):
* UIProcess/API/C/WKBackForwardListItem.h:
* UIProcess/API/C/WKBase.h:
* UIProcess/API/C/WKContext.cpp:
(WKContextGetTypeID):
* UIProcess/API/C/WKContext.h:
* UIProcess/API/C/WKFrame.cpp:
(WKFrameGetTypeID):
* UIProcess/API/C/WKFrame.h:
* UIProcess/API/C/WKFramePolicyListener.cpp:
(WKFramePolicyListenerGetTypeID):
* UIProcess/API/C/WKFramePolicyListener.h:
* UIProcess/API/C/WKNavigationData.cpp:
(WKNavigationDataGetTypeID):
* UIProcess/API/C/WKNavigationData.h:
* UIProcess/API/C/WKPage.cpp:
(WKPageGetTypeID):
* UIProcess/API/C/WKPage.h:
* UIProcess/API/C/WKPageNamespace.cpp:
(WKPageNamespaceGetTypeID):
* UIProcess/API/C/WKPageNamespace.h:
* UIProcess/API/C/WKPreferences.cpp:
(WKPreferencesGetTypeID):
* UIProcess/API/C/WKPreferences.h:
* UIProcess/API/C/WKString.cpp:
(WKStringGetTypeID):
* UIProcess/API/C/WKString.h:
* UIProcess/API/C/WKType.cpp: Added.
(WKGetTypeID):
* UIProcess/API/C/WKType.h: Added.
* UIProcess/API/C/WKURL.cpp:
(WKURLGetTypeID):
* UIProcess/API/C/WKURL.h:
* UIProcess/API/win/WKView.cpp:
(WKViewGetTypeID):
* UIProcess/API/win/WKView.h:
* UIProcess/WebBackForwardList.h:
(WebKit::WebBackForwardList::type):
* UIProcess/WebBackForwardListItem.h:
(WebKit::WebBackForwardListItem::type):
* UIProcess/WebContext.h:
(WebKit::WebContext::type):
* UIProcess/WebFramePolicyListenerProxy.h:
(WebKit::WebFramePolicyListenerProxy::type):
* UIProcess/WebFrameProxy.h:
(WebKit::WebFrameProxy::type):
* UIProcess/WebNavigationData.h:
(WebKit::WebNavigationData::type):
* UIProcess/WebPageNamespace.h:
(WebKit::WebPageNamespace::type):
* UIProcess/WebPageProxy.h:
(WebKit::WebPageProxy::type):
* UIProcess/WebPreferences.h:
(WebKit::WebPreferences::type):
* WebKit2.xcodeproj/project.pbxproj:
* WebProcess/InjectedBundle/API/c/WKBundle.cpp:
(WKBundleGetTypeID):
* WebProcess/InjectedBundle/API/c/WKBundle.h:
* WebProcess/InjectedBundle/API/c/WKBundleFrame.cpp:
(WKBundleFrameGetTypeID):
* WebProcess/InjectedBundle/API/c/WKBundleFrame.h:
* WebProcess/InjectedBundle/API/c/WKBundlePage.cpp:
(WKBundlePageGetTypeID):
(WKBundlePageSetEditorClient):
(WKBundlePageSetLoaderClient):
(WKBundlePageSetUIClient):
* WebProcess/InjectedBundle/API/c/WKBundlePage.h:
* WebProcess/WebPage/WebFrame.h:
(WebKit::WebFrame::type):
* WebProcess/WebPage/WebPage.h:
(WebKit::WebPage::type):
* win/WebKit2.vcproj:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@64253 268f45cc-cd09-0410-ab3c-d52691b4dbfc