Implement DOMPoint and DOMPointReadOnly

[tschneidereit]

[highfive]

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @pcwalton (or someone else) soon.

[pcwalton]

r? @jdm

[Ms2ger]

-S-awaiting-review +S-needs-code-changes

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Reviewed 6 of 6 files at r1, 40 of 40 files at r2.
Review status: all files reviewed at latest revision, 7 unresolved discussions, all commit checks successful.

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^{components/script/dom/dompoint.rs, line 13 [r2] (raw file):}
Spec pointer somewhere around here.

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^{components/script/dom/dompoint.rs, line 50 [r2] (raw file):}
-> () is typically only written out in generated code.

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^{components/script/dom/dompointreadonly.rs, line 13 [r2] (raw file):}
Spec link

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^{components/script/dom/dompointreadonly.rs, line 58 [r2] (raw file):}
Rm

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^{components/script/dom/webidls/DOMPoint.webidl, line 13 [r2] (raw file):}
No Pref.

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^{components/script/dom/webidls/DOMPoint.webidl, line 14 [r2] (raw file):}
This constructor doesn't exist in the spec for some irresponsible reason.

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^{components/script/dom/webidls/DOMPointReadOnly.webidl, line 13 [r2] (raw file):}
No Pref, and needs a spec link for the interface. Also needs a constructor.

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Comments from the review on Reviewable.io

[tschneidereit]

Thanks for the review, I think this addresses all comments. As discussed on IRC, I left out the DOMPoint(ReadOnly).fromPoint implementations because they're not implemented anywhere yet and might go away. Removing the DOMPointInit-using constructor and making DOMPointReadOnly constructible made more than half of the tests fail, but given that that's what the spec says, that's probably the tests' fault.
r? @Ms2ger

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Review status: 39 of 46 files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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^{components/script/dom/dompoint.rs, line 50 [r2] (raw file):}
Right, I just copied the definitions from the generated bindings, but should've cleaned them up.

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Comments from the review on Reviewable.io

[Ms2ger]

-S-awaiting-review +S-needs-squash

Squash all four commits and ping me, please.

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Reviewed 4 of 4 files at r3, 3 of 3 files at r4.
Review status: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from the review on Reviewable.io

[Ms2ger]

@bors-servo r+

[bors-servo]

📌 Commit 1790008 has been approved by Ms2ger

[bors-servo]

⌛ Testing commit 1790008 with merge 449fe56...

[bors-servo]

💔 Test failed - mac1

[jdm]

/_mozilla/mozilla/interfaces.html
---------------------------------
FAIL Interfaces exposed on the window

[Ms2ger]

@bors-servo r+

[bors-servo]

📌 Commit b692187 has been approved by Ms2ger

[bors-servo]

⌛ Testing commit b692187 with merge 658c3d0...

[bors-servo]

☀️ Test successful - android, gonk, linux1, linux2, linux3, mac1, mac2, mac3