Bug 923194. Make GLContext::InitWithPrefix not fatally assert when the GL version is too low. r=bjacob

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extra : rebase_source : 50af716547bbfb7cd25a828d708b2a9553e91c56
Bug 923193. Make transform-origin on SVG elements use the SVG bbox as the reference rectangle. r=heycam

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extra : rebase_source : 7c8d1b42a09b9389d082195edd0c683e2dc7e12e