Unprefix Page Visibility API

https://bugs.webkit.org/show_bug.cgi?id=102340

Source/WebCore:

Reviewed by Tim Horton.

Remove prefixes from the document properties, and the visibilitychanged event.

Rename the "preview" state to "unloaded". The "unloaded" state is never
reached yet (see https://bugs.webkit.org/show_bug.cgi?id=116769).

Add some comments to places where we should update the visibility state
when going in and out of the page cache, but cannot safely do so yet.

Tested by existing Page Visibility tests.

* dom/Document.cpp:
(WebCore::Document::pageVisibilityState):
(WebCore::Document::visibilityState):
(WebCore::Document::hidden):
(WebCore::Document::dispatchVisibilityStateChangeEvent):
* dom/Document.h:
* dom/Document.idl:
* dom/EventNames.h:
* history/CachedFrame.cpp:
(WebCore::CachedFrameBase::restore):
* loader/FrameLoader.cpp:
(WebCore::FrameLoader::stopLoading):
* page/Page.cpp:
(WebCore::Page::setVisibilityState):
* page/PageVisibilityState.cpp:
(WebCore::pageVisibilityStateString):
* page/PageVisibilityState.h:

Source/WebKit/efl:

Reviewed by Tim Horton.

Rename "preview" state to "unloaded" state.

* WebCoreSupport/AssertMatchingEnums.cpp:
* ewk/ewk_view.h:

Source/WebKit/mac:

Reviewed by Tim Horton.

Renaming of the "preview" state to "unloaded".

* WebView/WebView.mm:
* WebView/WebViewPrivate.h:

Source/WebKit2:

Reviewed by Tim Horton.

Renaming of the "preview" state to "unloaded".

* Shared/API/c/WKPageVisibilityTypes.h:
* Shared/API/c/WKSharedAPICast.h:
(WebKit::toPageVisibilityState):

Tools:

Reviewed by Tim Horton.

Rename "preview" state to "unloaded" state, and adjust the tests
to test for it.

* DumpRenderTree/mac/TestRunnerMac.mm:
(TestRunner::setPageVisibility):
* TestWebKitAPI/Tests/WebKit2/PageVisibilityState.cpp:
(TestWebKitAPI::setPageVisibilityStateWithEvalContinuation):
(TestWebKitAPI::didRunStep2StateChangeHiddenToPrerender):
(TestWebKitAPI::didRunStep3StateChangePrerenderToUnloaded):
(TestWebKitAPI::didRunStep4InStateUnloaded):
* TestWebKitAPI/Tests/mac/PageVisibilityStateWithWindowChanges.html:
* TestWebKitAPI/Tests/mac/PageVisibilityStateWithWindowChanges.mm:
(TestWebKitAPI::PageVisibilityStateWithWindowChanges::runTest):
* WebKitTestRunner/InjectedBundle/TestRunner.cpp:
(WTR::TestRunner::setPageVisibility):

LayoutTests:

Reviewed by Tim Horton.

Remove prefixes, adjust to state name changes.

* fast/events/page-visibility-iframe-delete-test.html:
* fast/events/page-visibility-iframe-move-test-expected.txt:
* fast/events/page-visibility-iframe-move-test.html:
* fast/events/page-visibility-iframe-propagation-test-expected.txt:
* fast/events/page-visibility-iframe-propagation-test.html:
* fast/events/page-visibility-null-view-expected.txt:
* fast/events/page-visibility-null-view.html:
* fast/events/page-visibility-transition-test-expected.txt:
* fast/events/page-visibility-transition-test.html:

Change-Id: I9751efeae0bab8136a63c7e22ad0d513fc8ceb0c
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150695 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@digia.com>