http://www.robohornet.org gives a score of 101.36 on master, and 102.68 with this PR. The latter is slightly better, but probably within noise level. So it looks like this PR does not affect DOM performance.
This is expected since `Box::new` is defined as:
```rust
impl<T> Box<T> {
#[inline(always)]
pub fn new(x: T) -> Box<T> {
box x
}
}
```
With inlining, it should compile to the same as box syntax.
Source-Repo: https://github.com/servo/servo
Source-Revision: a9022be0c3e30249845ca5947ac0c0a6743c7991
<!-- Please describe your changes on the following line: -->
Added a `TopLevelBrowsingContextId` type, which is a subtype of `BrowsingContextId` that only refers to top-level browsing contexts.
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Source-Repo: https://github.com/servo/servo
Source-Revision: a0d6d6883c3f2fde6f0f3e13712a569ce3aa41e5
<!-- Please describe your changes on the following line: -->
Now that script has `WindowProxy` rather than `BrowsingContext` objects, we can rename `Frame` in the constellation to `BrowsingContext`. In particular, this means that `FrameId`s are now `BrowsingContextid`s, which better captures their purpose (and they are used in a lot of places, not just the constellation).
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Source-Repo: https://github.com/servo/servo
Source-Revision: 837531992864f920342020462830b933d5ed0280
<!-- Please describe your changes on the following line: -->
Renamed `script::dom::BrowsingContext` to `script::dom::WindowProxy`.
The browsing context is mostly maintained in the constellation, not in script. It would be nice to rename `constellation::Frame` to `constellation::BrowsingContext`, but that will be very confusing if there are two `BrowsingContext` types.
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Source-Repo: https://github.com/servo/servo
Source-Revision: 34d0e59849a0a3e231e47fe10d66484340b8b80c
