defaultPlaybackRate not respected when set before source is loaded

defaultPlaybackRate not respected when set before source is loaded
https://bugs.webkit.org/show_bug.cgi?id=140282

Reviewed by Eric Carlson.

Source/WebCore:

Test: media/video-defaultplaybackrate-before-load.html

When the HTMLMediaElement is notified that the media player's rate has changed, it asks
for the rate from MediaPlayer. However, MediaPlayer never requests the playback rate
from the underlying MediaPlayerPrivate; it just returns the last rate which was set, or
1 if no rate was set. HTMLMediaElement then sets its playbackRate to the returned
value. So the end result is that the value from defaultPlaybackRate is overwritten by
the default value of 1 in MediaPlayer.

Rather than caching the requested rate in MediaPlayer, cache the value reported by
MediaPlayer inside HTMLMediaElement. And instead of returning the reported playback
rate from HTMLMediaElement.playbackRate, just return the last value set. The reported
value is still used for estimating the current time during playback.

Add MediaPlayerPrivate interface method to return the current playback rate.

* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::HTMLMediaElement): Initialize m_reportedPlaybackRate.
(WebCore::HTMLMediaElement::effectivePlaybackRate): Return m_reportedPlaybackRate.
(WebCore::HTMLMediaElement::requestedPlaybackRate): Return m_playbackRate.
(WebCore::HTMLMediaElement::updatePlaybackRate): Use requestedPlaybackRate() instead
    of effectivePlaybackRate();
(WebCore::HTMLMediaElement::ended): Ditto.
(WebCore::HTMLMediaElement::playbackProgressTimerFired): Ditto.
(WebCore::HTMLMediaElement::endedPlayback): Ditto.
(WebCore::HTMLMediaElement::updatePlayState): Ditto.
(WebCore::HTMLMediaElement::mediaPlayerTimeChanged): Ditto.
(WebCore::HTMLMediaElement::mediaPlayerRateChanged): Set m_reportedPlaybackRate.
(WebCore::HTMLMediaElement::mediaPlayerRequestedPlaybackRate): Return
    requestedPlaybackRate() if playing and 0 if not.
* html/HTMLMediaElement.h:
* platform/graphics/MediaPlayer.cpp:
(WebCore::MediaPlayer::MediaPlayer): Removed m_rate.
(WebCore::MediaPlayer::rate): Pass to MediaPlayerPrivate.
(WebCore::MediaPlayer::setRate): Do not cache the rate.
(WebCore::MediaPlayer::requestedRate): Added; ask HTMLMediaElement.
* platform/graphics/MediaPlayer.h:
(WebCore::MediaPlayerClient::mediaPlayerRequestedPlaybackRate): Added.
* platform/graphics/MediaPlayerPrivate.h:
(WebCore::MediaPlayerPrivateInterface::rate): Added.
* platform/graphics/avfoundation/MediaPlayerPrivateAVFoundation.cpp:
(WebCore::MediaPlayerPrivateAVFoundation::MediaPlayerPrivateAVFoundation):
    Do not cache the requested rate.
(WebCore::MediaPlayerPrivateAVFoundation::requestedRate): Pass to MediaPlayer.
(WebCore::MediaPlayerPrivateAVFoundation::setRate): Deleted.
* platform/graphics/avfoundation/MediaPlayerPrivateAVFoundation.h:
(WebCore::MediaPlayerPrivateAVFoundation::requestedRate): Deleted.
* platform/graphics/avfoundation/cf/MediaPlayerPrivateAVFoundationCF.cpp:
(WebCore::MediaPlayerPrivateAVFoundationCF::setRate): Renamed from updateRate.
(WebCore::MediaPlayerPrivateAVFoundationCF::rate): Fetch the rate from the player.
* platform/graphics/avfoundation/cf/MediaPlayerPrivateAVFoundationCF.h:
* platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.h:
* platform/graphics/avfoundation/objc/MediaPlayerPrivateAVFoundationObjC.mm:
(WebCore::MediaPlayerPrivateAVFoundationObjC::setRateDouble): Renamed from updateRate.
(WebCore::MediaPlayerPrivateAVFoundationObjC::rate): Fetch the rate from the player.
* platform/graphics/mac/MediaPlayerPrivateQTKit.h:
* platform/graphics/mac/MediaPlayerPrivateQTKit.mm:
(WebCore::MediaPlayerPrivateQTKit::rate): Fetch the rate from the QTMovie.

LayoutTests:

* media/video-defaultplaybackrate-before-load-expected.txt: Added.
* media/video-defaultplaybackrate-before-load.html: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@178367 268f45cc-cd09-0410-ab3c-d52691b4dbfc