Support for webxr layer management
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This adds layer management to servo's webxr implementation, and removes all the special-cased code for openxr surface creation and opaque framebuffers.
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Implement GPUBuffer.mapAsync and update wgpu-core
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This PR covers the following-
1. update wgpu-core to use serializable `RenderPass` and `ComputePass`. Implement `DispatchIndirect`.
2. Implement `GPUBuffer.mapAsync()`.
The `mapAsync()` methods has the following flow-
1. A new promise is created in `mapAsync()` and a message sent to the server-side. This returns a promise.
2. On the server-side, a `struct BufferMapInfo` object stores the relevant info required to send data to the client-side on completion of mapping. This object is stored in a `buffer_maps: HashMap<id::BufferId, BufferMapInfo<'a>>,` in `WGPU`. `buffers_maps` basically stores the data for buffers with pending mapping.
3. `buffer_map_async()` command is issued with a callback responsible to send the data back to the client.
4. All the devices are polled every time the server receives a new message.
5. The data is sent back on completion and promise resolved through `AsyncWGPUListener` (similar to how the `requestDevice()` and `RequestAdapter` are processed).
6. On receiving the data, the client sends back a `BufferMapComplete` message to the server to remove the entry from `buffer_maps` hashmap.
I intended to implement `getMappedRange()`, too, in this PR but it's quite a task in itself (implementing intersecting ArrayBuffers). This already being a 500+ line PR, I thought it best to get this model approved first (also it will probably be easier to review this and `getMappedRange` separately). `getMappedRange` would come up in the next one.
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Update winapi
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build(deps): bump openssl from 0.10.29 to 0.10.30
Bumps [openssl](https://github.com/sfackler/rust-openssl) from 0.10.29 to 0.10.30.
<details>
<summary>Commits</summary>
<ul>
<li><a href="d8395ba415"><code>d8395ba</code></a> Release openssl v0.10.30</li>
<li><a href="ff4a2152dc"><code>ff4a215</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sfackler/rust-openssl/issues/1306">#1306</a> from crdumoul/master</li>
<li><a href="78c77b288c"><code>78c77b2</code></a> Add SslStream::from_raw_parts</li>
<li><a href="164bb84bd1"><code>164bb84</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sfackler/rust-openssl/issues/1299">#1299</a> from flokli/siganture</li>
<li><a href="3e12906302"><code>3e12906</code></a> sign.rs: fix typo in comment</li>
<li><a href="2f98f1c821"><code>2f98f1c</code></a> Fix CI branch</li>
<li><a href="f5c89a0b94"><code>f5c89a0</code></a> remove appveyor builds</li>
<li><a href="7546bfd148"><code>7546bfd</code></a> Ignore default verify paths test on windows</li>
<li><a href="60118dddad"><code>60118dd</code></a> test env lookup</li>
<li><a href="52c1b6fdc2"><code>52c1b6f</code></a> set vcpkg root</li>
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build(deps): bump procedural-masquerade from 0.1.6 to 0.1.7
Bumps [procedural-masquerade](https://github.com/servo/rust-cssparser) from 0.1.6 to 0.1.7.
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<li><a href="3e911361d2"><code>3e91136</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/274">#274</a> - servo:pretty-printing-agnostic, r=emilio</li>
<li><a href="2976bf450b"><code>2976bf4</code></a> Make procedural-masquerade resilient to macro input pretty-printing changes</li>
<li><a href="7c9854ebf5"><code>7c9854e</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/267">#267</a> - servo:bump-smallvec, r=emilio</li>
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<li><a href="cfd59cabd5"><code>cfd59ca</code></a> Clean up a bit now that lifetimes are non-lexical.</li>
<li><a href="efc1b25b69"><code>efc1b25</code></a> Bump smallvec to 1.0, release new minor version (0.27.2)</li>
<li><a href="65d6c3e0a5"><code>65d6c3e</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/265">#265</a> - servo:those-without-syn, r=nox</li>
<li><a href="d4af92c10b"><code>d4af92c</code></a> Simplify the implementation of ascii_case_insensitive_phf_map</li>
<li><a href="610cc2215c"><code>610cc22</code></a> Add support for attributes on match arms in match_ignore_ascii_case!</li>
<li><a href="5188d5e0b2"><code>5188d5e</code></a> Auto merge of <a href="https://github-redirect.dependabot.com/servo/rust-cssparser/issues/264">#264</a> - servo:those-without-syn, r=nox</li>
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build(deps): bump miow from 0.3.3 to 0.3.5
Bumps [miow](https://github.com/yoshuawuyts/miow) from 0.3.3 to 0.3.5.
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build(deps): bump rayon from 1.3.0 to 1.3.1
Bumps [rayon](https://github.com/rayon-rs/rayon) from 1.3.0 to 1.3.1.
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<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rayon-rs/rayon/blob/master/RELEASES.md">rayon's changelog</a>.</em></p>
<blockquote>
<h1>Release rayon 1.3.1 / rayon-core 1.7.1 (2020-06-15)</h1>
<ul>
<li>Fixed a use-after-free race in calls blocked between two rayon thread pools.</li>
<li>Collecting to an indexed <code>Vec</code> now drops any partial writes while unwinding,
rather than just leaking them. If dropping also panics, Rust will abort.
<ul>
<li>Note: the old leaking behavior is considered <em>safe</em>, just not ideal.</li>
</ul>
</li>
<li>The new <code>IndexedParallelIterator::step_by()</code> adapts an iterator to step
through items by the given count, like <code>Iterator::step_by()</code>.</li>
<li>The new <code>ParallelSlice::par_chunks_exact()</code> and mutable equivalent
<code>ParallelSliceMut::par_chunks_exact_mut()</code> ensure that the chunks always have
the exact length requested, leaving any remainder separate, like the slice
methods <code>chunks_exact()</code> and <code>chunks_exact_mut()</code>.</li>
</ul>
<h2>Contributors</h2>
<p>Thanks to all of the contributors for this release!</p>
<ul>
<li><a href="https://github.com/adrian5">@adrian5</a></li>
<li><a href="https://github.com/bluss">@bluss</a></li>
<li><a href="https://github.com/cuviper">@cuviper</a></li>
<li><a href="https://github.com/FlyingCanoe">@FlyingCanoe</a></li>
<li><a href="https://github.com/GuillaumeGomez">@GuillaumeGomez</a></li>
<li><a href="https://github.com/matthiasbeyer">@matthiasbeyer</a></li>
<li><a href="https://github.com/picoHz">@picoHz</a></li>
<li><a href="https://github.com/zesterer">@zesterer</a></li>
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<li><a href="a798276590"><code>a798276</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/769">#769</a></li>
<li><a href="4bce3c8f27"><code>4bce3c8</code></a> Update ci/compat-Cargo.lock</li>
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<li><a href="8f58a12b51"><code>8f58a12</code></a> Fix wrong examples of find_map variants</li>
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<li><a href="94baa8232c"><code>94baa82</code></a> Add collect unwinding test for zero-sized elements</li>
<li><a href="b5869e4553"><code>b5869e4</code></a> Remove redundant Send impl for CollectFolder</li>
<li><a href="7a0c42e649"><code>7a0c42e</code></a> Move collect test to its own file</li>
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build(deps): bump urlencoding from 1.0.0 to 1.1.1
Bumps [urlencoding](https://github.com/kornelski/rust_urlencoding) from 1.0.0 to 1.1.1.
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animations: Finish support for fractional iteration counts
This change also improves support for creating animations with negative
delays, as that is necessary to test support for fractional iteration
lengths.
Fixes: #14858
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build(deps): bump gstreamer from 0.15.6 to 0.15.7
Bumps gstreamer from 0.15.6 to 0.15.7.
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This conversion can lead to floating point errors and extra work when
computing animations. Avoiding it allows animation-iteration-count-009.html
to pass.
This change also improves support for creating animations with negative
delays, as that is necessary to test support for fractional iteration
lengths.
This change also adjusts existing Servo animation tests which assumed
that advancing to the exact moment of the end of the animation would be
considered "before the end." With this change, this moment is "after the
end."
Fixes: #14858
build(deps): bump bzip2-sys from 0.1.7 to 0.1.9+1.0.8
Bumps [bzip2-sys](https://github.com/alexcrichton/bzip2-rs) from 0.1.7 to 0.1.9+1.0.8.
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