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Implements the initial steps from:
https://github.com/servo/servo/wiki/Canvas-rendering-project
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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).
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- [X] There are tests for these changes OR
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Source-Repo: https://github.com/servo/servo
Source-Revision: 9cd60c8e78af7b80e7578612ae442de26d1a325b
1906c5457d