GamepadButtonList::sync_from_vr should use more iterators #20392
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Used the zip function instead of iterating over both vectors with an indexing variable and using unwrap.
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Sanitize Heap::handle(_mut) functions
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Complementary to https://github.com/servo/rust-mozjs/pull/404.
Removing `Heap::handle_mut` didn't warrant any changes on Servo side, and so the changes here are only to fix compilation with `Heap::handle` being now marked as `unsafe`.
The main idea is that we can't hand out handles to heap values themselves, since they're not guaranteed to be rooted, but it's safe to do when we are - hence why the safe impl on `RootedTraceableBox<Heap<T>>` and why it's safe to use inside structs that hold a Heap and are `#[must_root]`.
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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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- This PR manually verified on local mac OS machine.
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getRandomValues uses ArrayBufferView now
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- Changed the `Crypto.webidl` file to allow getRandomValues to recieve an ArrayBufferView as input
- Removed unnecesary checks from `crypto.rs` and did the necessary changes to match the `webidl` changes.
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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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Those parameters aren't optional in the current spec.
The test element-array-buffer-delete-recreate.html now fails because we don't
actually implement gl.getParameter(gl.CURRENT_PROGRAM).
Implement WebGL getFrameBufferAttachmentParameter API
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Implementation of `getFramebufferAttachmentParameter` as in WebGL1 specification.
Part of https://github.com/servo/servo/issues/10209.
r? emilio or jdm.
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