Update heartbeats-simple to 0.3.0
Updated heartbeats-simple dependency for native changes:
-Collapse libraries into one.
-Remove overriding of some default CMake behavior.
-Windows compatibility with compiler flags, locking, and sleeping in example (thanks Jack Moffitt and Vladimir Vukicevic).
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use less repetitive name
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Support keyword values for 'cursor' in geckolib
This has a big hard-coded `match` instead of a generated one because Servo's Cursor enum is not generated by Mako code; instead it's in `style_traits` where it can be shared with Servo's gfx and windowing code.
We *could* move this mapping into the macro that generates the Cursor enum, but it would either involve the same amount of code duplication, or make style_traits depend on gecko_bindings. I'm not really sure which is best; open to suggestions.
r? @emilio
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Mozbrowser top level browsing context
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Got `window.top` and `window.parent` to return the right result inside a `mozbrowser` iframe.
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Map glutin modifier keycodes to servo keycodes.
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Make it possible to receive DOM events for modifiers keys.
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Generate debug and release Gecko bindings.
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This makes `generate_style_structs.py` generate bindings for both `DEBUG` and non-`DEBUG` Gecko configurations. The corresponding generated bindings are used in geckolib based on `cfg(debug-assertions)`.
I regenerated bindings on top of Gecko master plus https://bugzilla.mozilla.org/show_bug.cgi?id=1277154 (landing soon), which tripped up the bindgen due to bitfield layout issues.
r? @emilio
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