[Webkit-unassigned] [Bug 173302] REGRESSION (r217997): mint.com header renders incorrectly when initially loaded

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173302

--- Comment #4 from Chris Dumez <cdumez at apple.com> ---
Better logging:
Created ImplicitAnimation 0x1139bcc60 on renderer 0x112d09528 for property background-color duration 0.40 delay 0.00
Created ImplicitAnimation 0x1139bccf0 on renderer 0x112d09528 for property border-bottom-color duration 0.40 delay 0.00
0x1139bcc60 AnimationState New -> AnimationState::PausedNew
0x1139bccf0 AnimationState New -> AnimationState::PausedNew
Created ImplicitAnimation 0x1139bc360 on renderer 0x112f68738 for property color duration 0.25 delay 0.00
0x1139bc360 AnimationState New -> AnimationState::PausedNew
0x1139bcc60 AnimationState PausedNew -> PausedWaitResponse
0x1139bccf0 AnimationState PausedNew -> PausedWaitResponse
0x1139bc360 AnimationState PausedNew -> PausedWaitResponse
CompositeAnimation::resumeAnimations() 2 transitions
-> Transition 0x1139bcc60, hasStyle? 1
0x1139bcc60 - AnimationBase::updatePlayState(0) returns early, pause: 0, paused(): 0, isNew: 0
-> Transition 0x1139bccf0, hasStyle? 1
0x1139bccf0 - AnimationBase::updatePlayState(0) returns early, pause: 0, paused(): 0, isNew: 0
CompositeAnimation::resumeAnimations() 1 transitions
-> Transition 0x1139bc360, hasStyle? 1
0x1139bc360 - AnimationBase::updatePlayState(0) returns early, pause: 0, paused(): 0, isNew: 0


It looks like something at some point caused those ImplicitAnimations to switch from state PausedNew to PausedWaitResponse. As a result, when we later resume animations and call AnimationBase::updatePlayState(AnimPlayStatePlaying), that method returns early and fails to start the animation because of this check in updatePlayState():

    if (pause == paused() && !isNew()) {
        WTFLogAlways("%p - AnimationBase::updatePlayState(%d) returns early, pause: %d, paused(): %d, isNew: %d", this, static_cast<int>(playState), pause, paused(), isNew());
        return;
    }

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