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Support empty strings as the repeat argument (CreatePattern) According to the third step in the specification [1], createPattern should let the repetition argument be "repeat" when it is the empty string. The code in CanvasRenderingContext2D::CreatePattern did not implement this step and instead threw a SyntaxError exception when an empty string was supplied as the repetition argument. Fixes #9079. [1] https://html.spec.whatwg.org/multipage/#dom-context-2d-createpattern <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/servo/servo/9109) <!-- Reviewable:end -->