Update Rust to 1.14.0-nightly (7c69b0d5a 2016-11-01)
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Layout viewer fixes
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This is a followup for #13432. This patch should be landed after #13740 to accommodate the change in JSON format in #13740. It also included some UI layout fixes to make the UI more readable. I'm splitting the commits for easier review, I'll squash them after a r+.
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Implement matchMedia and MediaQueryList
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Fixes#13376.
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Fold some DisplayList methods into DisplayListBuildState
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This makes the API used to build display lists quite a bit simpler and
reduces the amount of auxiliary data structures that need to be passed
around. It is also important preparation work for separating scrolling
areas from stacking contexts.
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Parsing/Serialization for scroll-snap-points-*
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Implements Parsing/Serialization for scroll-snap-points-x and scroll-snap-points-y
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This matches the previous default (network.mime.sniff off) behaviour in all
but one case: we will now accept a font without a `Content-Type` header, which
would previously have been ignored.
This makes the API used to build display lists quite a bit simpler and
reduces the amount of auxiliary data structures that need to be passed
around. It is also important preparation work for separating scrolling
areas from stacking contexts.
