chore(vscode): Add VSCode recommended extensions
The provided `extensions.json` file is based on the one [in `mozilla‑central`][mozilla‑central‑vscode‑extensions].
[mozilla‑central‑vscode‑extensions]: https://hg.mozilla.org/mozilla-central/file/tip/.vscode/extensions.json
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Implement SwitchToWindow and DismissAlert WebDriver commands
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Let resources timing entries be added to performance entry buffer.
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Update relevant tests to properly report and expect failure.
These changes are the first step for #23328. Not sure if I would say they _fix_ the issue.
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Update Travis CI URLs
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Implement Status WebDriver command
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Fix panic on opening a directory
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Continued from https://github.com/servo/servo/pull/23548
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Implement GetPageSource WebDriver command
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Various improvements and update to the http cache
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Filter intermittent wdspec tests failures
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With this change, the intermittent failures for wdspec tests will be filtered and reported.
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Update remove_dir_all
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Fixed magicleap Servo2D application
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Sigh, of course the latest changes for immersive Servo on the ML1 broke the landscape app.
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Run wdspec tests in a different job
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Remove sampling profiler unit test.
This test is the source of significant intermittent failures in TravisCI and Appveyor, and occasionally on taskcluster as well. It is not pulling its weight. Fixes#23354.
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