Add gecko glue for perspective/transform properties
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To be able to add glue for these properties, we needed to change their structs. They are moved from effects to box and added stylo glue.
This PR covers these properties:
- perspective
- perspective-origin
- backface-visibility
- transform-box
- transform-style
- transform-origin
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Store unset keyword as specified value
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`unset` keyword value should *not* be converted to something else during parsing. It is a specified-value time value, which should be preserved until computation.
WIP patch for seeing what tests would be broken and / or if there is necessary to add any new test.
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Change property id of moz-prefixed properties to match their name
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This is the servo part of [bug 1311870](https://bugzilla.mozilla.org/show_bug.cgi?id=1311870) which has been reviewed by @heycam.
r? @heycam
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stylo: Fix assertion for unresolvable url
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This is the Servo part of [bug 1321176](https://bugzilla.mozilla.org/show_bug.cgi?id=1321176), which has been reviewed by @emilio, @Manishearth, and @heycam.
r? @Manishearth
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Stylo: Basic support for grid-{row,column}-{start,end}
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Implement background-position-x/y
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This is a WIP PR. Just HorizontalPosition / VerticalPosition implementations are complete. I would like to get early feedbacks about this architecture. Here's some architectural topics to consider:
- I created `HorizontalPosition` and `VerticalPosition` structs for this and used them in `Position` as well. We have decided to split `Keyword` enum, but we need them as unified for `PositionComponent` enum. So I didn't split but I can split it if we prefer to change PositionComponent as well.
- If we prefer Keyword enum like this, we can create a SubPosition(or something like this) instead of HorizontalPosition/VerticalPosition enums since only difference is 2 lines in `parse` functions. We can create a `parse_horizontal` and `parse_vertical` instead and a lot of code duplication can be cleared.
- I couldn't find a good way to use HorizontalPosition/VerticalPosition's parse functions in `Position`'s parse function. It is a bit more complicated. I'm open to suggestions :)
- I don't know much about logical keywords so do I need to do something different? I placed some comments where logical keywords are processing.
Any advice about these?
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