Measure time required before a layout query is serviced by the layout thread
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- [X] extract QueryMsg from ReflowGoal
- [X] introduce QueryMsg timestamp
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feat(capture_webrender): write webrender revision into text
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Relates to https://github.com/servo/servo/pull/20315#issuecomment-373819735.
This PR try to generate `wr.txt` when trigger webrender capture. By reading gecko's implementation at [here](3b8e63c66a/gfx/doc/README.webrender (L53)), it seems gecko's build script generates txt file for containing revision of webrender and read it each time trigger capturing.
In this PR tries to similar in cruxwise with small differences:
- `cargo build` reads `cargo.lock`, export it into `${OUT_DIR}/`, included via macro in build time.
- when capturing triggered, those revision will be written as `wr.txt`.
Probably point of discussion & need to be updated in PR if necessary:
~- Is it acceptable `mach` generates module file on build bootstrapping? Should there be other recommendation?~ Now cargo build takes care of generation.
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Profiler for blocked IpcReceiver::recv()
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Implements feature #19223
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WIP.
@jdm - this is the new profiler : "Blocked at IPC Receive"
Should I dig through all the calls to `ipc::channel` and replace them with this profiled `IpcReceiver`?

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Don't use unsafe Heap::new constructor
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Pulls https://github.com/servo/rust-mozjs/pull/398 and aims to close https://github.com/servo/rust-mozjs/issues/343.
We can't convert from `JSVal` to `Heap<JSVal>` safely (due to GC barriers we can't move Heap value after changing its underlying value to something meaningful, e.g. non-null or non-undefined), so I decided to also wrap the Heap values in a Box (and in dictionaries in RootedTraceableBox, see https://github.com/servo/servo/pull/20265#issuecomment-372838379 and the issue for more details) in dictionaries.
Since we allocate more to be safe, I think it'd be good to also do some sort of a JS perf run, if there is any to see if there's any significant overhead.
r? @jdm
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Use typed coordinates more
Requires https://github.com/servo/servo/pull/19895
We use Size2D and Point2D across compositing, constellation and script, loosing the type of pixels we use (DevicePixel, DeviceIndepententPixel or CSSPixel) along the way, which might lead to bugs like `window.outerHeight` not taking into account the page zoom (using DeviceIndepententPixel instead of CSSPixel).
This should make the situation a bit better.
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Update gleam to 0.4.24
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Needed to expose `get_framebuffer_attachment_parameter_iv()`.
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Fix JS object conversion in unions
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Requires safe `Heap::boxed` constructor from https://github.com/servo/rust-mozjs/pull/395 (more info on it is in the PR).
Since unions currently assume that their respective members root themselves and can be stored on heap, I modified the union member object conversion branch to convert to a `RootedTraceableBox<Heap<*mut JSObject>>` (which is the currently generated type for objects in said unions).
I did it only for Unions and not dictionaries, since some dictionaries had bare `*mut JSObject` members - is this a mistake and something that needs further fixing?
Does this need a test, e.g. passing a union with object to a function that returns said object, and comparing the results for equality?
r? @jdm
Generated code with this patch (for `StringOrObject`):
```rust
impl FromJSValConvertible for StringOrObject {
type Config = ();
unsafe fn from_jsval(cx: *mut JSContext,
value: HandleValue,
_option: ())
-> Result<ConversionResult<StringOrObject>, ()> {
if value.get().is_object() {
match StringOrObject::TryConvertToObject(cx, value) {
Err(_) => return Err(()),
Ok(Some(value)) => return Ok(ConversionResult::Success(StringOrObject::Object(value))),
Ok(None) => (),
}
}
// (...)
}
}
impl StringOrObject {
// (...)
unsafe fn TryConvertToObject(cx: *mut JSContext, value: HandleValue) -> Result<Option<RootedTraceableBox<Heap<*mut JSObject>>>, ()> {
Ok(Some(RootedTraceableBox::from_box(Heap::boxed(value.get().to_object()))))
}
}
```
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