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WebGPU: Use GPULimits and extensions provided by user
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- update wgpu
- spec update
r?@kvark
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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
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Resolve `whenDefined` with the class constructor
I still don't have time to find the root cause of why nightly sync failed :( so we don't have the tests in our tree now.
But I tried to verify it with `wpt.live` that this is correct
<img width="1136" alt="image" src="https://user-images.githubusercontent.com/6782666/92739547-f7ca0c80-f3b7-11ea-966e-fd7ecd2638cf.png">
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#27626
- [x] There are tests for these changes
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Update wgpu and WebGPU CTS to include copy validation tests
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r?@kvark
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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
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