Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# WebRender
+
+[![Version](https://img.shields.io/crates/v/webrender.svg)](https://crates.io/crates/webrender)
+
+WebRender is a GPU-based 2D rendering engine written in [Rust](https://www.rust-lang.org/). [Firefox](https://www.mozilla.org/firefox), the research web browser [Servo](https://github.com/servo/servo), and other GUI frameworks draw with it. It currently uses the OpenGL API internally.
+
+Note that the canonical home for this code is in gfx/wr folder of the
+mozilla-central repository at https://hg.mozilla.org/mozilla-central. The
+Github repository at https://github.com/servo/webrender should be considered
+a downstream mirror, although it contains additional metadata (such as Github
+wiki pages) that do not exist in mozilla-central. Pull requests against the
+Github repository are still being accepted, although once reviewed, they will
+be landed on mozilla-central first and then mirrored back. If you are familiar
+with the mozilla-central contribution workflow, filing bugs in
+[Bugzilla](https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=Graphics%3A%20WebRender)
+and submitting patches there would be preferred.
+
+## Update as a Dependency
+After updating shaders in WebRender, go to servo and:
+
+  * Go to the servo directory and do ./mach update-cargo -p webrender
+  * Create a pull request to servo
+
+
+## Use WebRender with Servo
+To use a local copy of WebRender with servo, go to your servo build directory and:
+
+  * Edit Cargo.toml
+  * Add at the end of the file:
+
+```
+[patch."https://github.com/servo/webrender"]
+"webrender" = { path = "<path>/webrender" }
+"webrender_api" = { path = "<path>/webrender_api" }
+```
+
+where `<path>` is the path to your local copy of WebRender.
+
+  * Build as normal
+
+## Documentation
+
+The Wiki has a [few pages](https://github.com/servo/webrender/wiki/) describing the internals and conventions of WebRender.
+
+## Testing
+
+Tests run using OSMesa to get consistent rendering across platforms.
+
+Still there may be differences depending on font libraries on your system, for
+example.
+
+See [this gist](https://gist.github.com/finalfantasia/129cae811e02bf4551ac) for
+how to make the text tests useful in Fedora, for example.