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
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 97a17674f72dbfcb99552fe4877789f149ccfc84
Full implementation of EventSource, complete with closing and reopening streams.
Fixes#8925.
Source-Repo: https://github.com/servo/servo
Source-Revision: 579ab2d99cd8c07a31c3b68a4659c484d5189ada
This is a large-ish PR that contains the following:
* A new directory is created under `components/script/` called `task_source`, which houses all the stuff for different task sources. Note that the ones that I have now aren't exhaustive - there are more task sources than just the generic ones.
* A `DOMManipulationTaskMsg` which eliminates some usage of `Runnable`s to fire events. Instead, they send event information to the `DOMManipulationTaskSource` and lets the `ScriptTask` handle all the event firing.
* Re-added `fn script_chan`, since I can't think of any other way to give `Trusted` values an appropriate sender.
* Rewrote step 7 of [the end](https://html.spec.whatwg.org/multipage/syntax.html#the-end) to make use of the `DOMManipulationTaskSource`
Partial #7959
Source-Repo: https://github.com/servo/servo
Source-Revision: 740965e39f4d62e5807d21734ed9a7a881eca392
