Two things are included in this patch:
1. Implement ComputeDistance for border-spacing, so we could get the right
distance while doing animations.
2. Implement clone function for gecko glue code of border-spacing, so we
could make animations of border-spacing work properly in stylo build.
Gecko side patch: Bug 1354437
Implement frames timing function
A frames timing function is a type of timing function that divides the input time into a specified number of intervals of equal length, each of which is associated with an output progress value of increasing value.
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The existing code here appears to be wrong since we should allow *both*
animation and transition restyles to appear at the same time. This patch
fixes the assertion and subsequent check and also extends it to support
all animation restyle hints, including SMIL.
Now this method covers SMIL override rules, CSS animation / script
animation rules, and CSS transition rules so we should just use
"animation" in the generic sense.
Three keyword types are created through a macro but have some of their
impl's handled elsewhere. Since all impl's are the same, this commit
moves them into the macro to have them auto generated, for more concise
code.
Bug 1341703 - Support border-image with url()
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Gecko 1341703 should be land immediately after this PR been merged.
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stylo: Bug 1357357 - Make the parser of transition-property match the spec.
These are interdependent patches of Bug 1357357. We add one more arm, TransitionProperty::Unsupported, which stores the string of non-animatable, custom, or unrecognized property, so we can parse these kinds of properties and serialize them correctly. This is necessary because we need to start transitions even though some transition-properties are non-animatable, custom, or unrecognized.
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1. We add a new arm to TransitionProperty, TransitionProperty::Unsupported,
which contains an Atom, so it's better to remove the Copy trait from
TransitionProperty.
2. TransitionProperty::Unsupported(Atom) represents any non-animatable, custom,
or unrecognized property, and we use Atom to store the ident string for
serialization.
Fix overflow in ::nth-child()
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This is a PR of https://bugzilla.mozilla.org/show_bug.cgi?id=1358754
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