Add Client type for ServiceWorkerGlobalScope environments#1074

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wanderview wants to merge 2 commits intow3c:mainfrom wanderview:dev-serviceworker-client

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Commits on Feb 15, 2017

Rename 'service worker client' to just 'client'. w3c#1036
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Add the 'service worker client' for Client objects representing ServiceWorkerGlobalScope. Fixes w3c#1036
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