Reviewed by Darin Adler.
        
        https://bugs.webkit.org/show_bug.cgi?id=25627
        Bug 25627: HTMLMediaElement: some errors should fire on <source> elements

        Update for HTML5 spec change to fire 'error' events on <source> element
        when there is a failure while processing/loading a <source>.

        Test: media/video-source-error.html

        * html/HTMLMediaElement.cpp:
        (WebCore::HTMLMediaElement::enqueueEvent): Remove white-space.
        (WebCore::HTMLMediaElement::loadInternal): Call cancelPendingEventsAndCallbacks instead
        of just calling m_pendingEvents.clear() as we now also need to cancel pending errors on
        all <source> element. 
        (WebCore::HTMLMediaElement::selectMediaResource): Call isSafeToLoadURL() here instead of in
        loadResource() as we need to report errors differently depending on the type of failure. Use
        KURL instead of String.
        (WebCore::HTMLMediaElement::loadNextSourceChild): nextSourceChild -> selectNextSourceChild.
        Fail silently when there are no more <source> canditates because that is what spec mandates.
        Keep url as KURL instead of converting to String.
        (WebCore::HTMLMediaElement::loadResource): ASSERT that the URL is safe to load as we now 
        assume the safety check now done before this function. Takes KURL instead of String.
        (WebCore::HTMLMediaElement::isSafeToLoadURL): New, checks to see if a url is safe to load, logs
        failure if not.
        (WebCore::HTMLMediaElement::noneSupported): MEDIA_ERR_NONE_SUPPORTED -> MEDIA_ERR_SRC_NOT_SUPPORTED
        (WebCore::HTMLMediaElement::cancelPendingEventsAndCallbacks): New, clear all events pending on
        the media and all source elements.
        (WebCore::HTMLMediaElement::setNetworkState): Fire an error on the source element when the 
        the failure happened while processing one. Only call nonSupported() when the failure happened
        while processing media element 'src' attribute.
        (WebCore::HTMLMediaElement::havePotentialSourceChild): nextSourceChild -> selectNextSourceChild.
        Deal with selectNextSourceChild returning a KURL instead of a String.
        (WebCore::HTMLMediaElement::selectNextSourceChild): Renamed from nextSourceChild, add optional
        param to control whether or not errors are fired on a source element when it will not be used.
        Check safety of url here instead of waiting until loadResource(). Return a KURL instead of a
        String.
        (WebCore::HTMLMediaElement::initialURL): nextSourceChild -> selectNextSourceChild. Keep url as
        a KURL instead of a String.
        * html/HTMLMediaElement.h:
        (WebCore::HTMLMediaElement::):

        * html/HTMLSourceElement.cpp:
        (WebCore::HTMLSourceElement::HTMLSourceElement): Initialize timer related variables.
        (WebCore::HTMLSourceElement::scheduleErrorEvent): New, start one-shot timer to fire an error
        event ASAP.
        (WebCore::HTMLSourceElement::cancelPendingErrorEvent): New, cancel pending error event.
        (WebCore::HTMLSourceElement::errorEventTimerFired): New, fire error event if it has not been
        cancelled.
        * html/HTMLSourceElement.h:

        * html/MediaError.h: 
        (WebCore::MediaError::): MEDIA_ERR_NONE_SUPPORTED -> MEDIA_ERR_SRC_NOT_SUPPORTED
        * html/MediaError.idl: Ditto

2009-05-08  Eric Carlson  <eric.carlson@apple.com>

        Reviewed by Darin Adler.

        https://bugs.webkit.org/show_bug.cgi?id=25627
        Bug 25627: HTMLMediaElement: some errors should fire on <source> elements

        Update tests for MEDIA_ERR_NONE_SUPPORTED change to MEDIA_ERR_SRC_NOT_SUPPORTED.
        Add video-source-error.html to test errors fired on <source> elements .

        * media/media-constants-expected.txt:
        * media/media-constants.html:
        * media/unsupported-rtsp.html:
        * media/video-error-does-not-exist.html:
        * media/video-source-error.html: Added.
        * media/video-src-change.html:
        * media/video-src-invalid-remove.html:
        * media/video-src-plus-source.html:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43403 268f45cc-cd09-0410-ab3c-d52691b4dbfc