We need 'dom.animations-api.core.enabled' preference to test animation.
In this patch, set the preference before DOMWindowUtils test with animation.
MozReview-Commit-ID: 9lz0hWvyo83
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extra : rebase_source : 1972bab70063a354efb57115b8ffed9e1bb41623
In this patch, we implement nsIDOMWindowUtils::GetUnanimatedComputedStyle
which returns computed value of given CSS property without animation rule. This
method is used from the DevTools animation inspector to fill in keyframe values
when the property value is null (indicating that the underlying/base value is
being used).
In order to implement this, we extend nsComputedDOMStyle constructor to fetch
the computed style minus animation style (i.e. the base style). This is somewhat
complicated by the fact that for discrete animation.
StyleAnimationValue::ExtractComputedValue may return ‘unset’, ‘initial’ or
‘inherit’. For example, if the author uses the 'unset' 'initial' or 'inherit'
keyword for a discrete property (e.g. 'align-content’), ExtractComputedValue
returns the keywords as-is. Furthermore, if the user does not set any specific
keyword, ExtractComputedValue returns ‘unset’. We use this new
nsComputedDOMStyle mechanism to resolve these keywords into a valid keyword for
computed style in the same way as other properties (e.g. ‘opacity’).
MozReview-Commit-ID: HffJ9SCDf2k
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extra : rebase_source : 64df3850b862dada5f8e0767d47dc478d454ba31