Use the same animation begin time while updating compositing layers

[Simon Fraser (smfr)]

RenderLayerCompositor::updateCompositingLayers() ends up calling code that relies on the current state of animations, via calls to RenderLayer::currentTransform(). This is called while mapping layer bounds to absolute coordinates, for overlap testing.

We should treat the entire compositing layer update as one animation batch (begin/end animation update). Without this, it's impossible to compare the results of coordinate mapping via two different code paths in ASSERTs. It seems reasonable to do anyway.

[Simon Fraser (smfr)]

Created attachment 143356 [details]
Patch

[Dean Jackson]

Comment on attachment 143356 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=143356&action=review

> Source/WebCore/ChangeLog:26
> +        to cover over calls to recalcStyle which might need this (87159).

over-calls?

> Source/WebCore/css/CSSComputedStyleDeclaration.cpp:1325
> +        AnimationUpdateBlock animationBlock(renderer->animation());

I like animationUpdateBlock as the var names through the patch, but not a big deal.

> Source/WebCore/rendering/RenderLayerCompositor.cpp:354
> +    Frame* frame = m_renderView->frameView()->frame();
> +    AnimationUpdateBlock animationBlock(frame->animation());

One line? no need for frame elsewhere?

[Simon Fraser (smfr)]

http://trac.webkit.org/changeset/118052