Bug 945222 - Initial import of web-platform-tests testsuite 1/4: test data

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extra : rebase_source : d635a4f39c587d4d381b486dd63de747865b77a2
Bug 945222 - Initial import of web-platform-tests testsuite 2/4: Expected test result metadata for Gecko.

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extra : rebase_source : 360de1a59d436df45a18ebbd9338febf67c93717
Bug 945222 - Initial import of web-platform-tests testsuite 3/4: wptrunner test harness, r=ahal,Ms2ger,ato

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extra : rebase_source : a217cafc7f1ec8335e0c1a1a7082ef9c2c606db5
Bug 945222 - Initial import of web-platform-tests testsuite 4/4 : Integration with build system, mach and mozharness, r=ahal,gps

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extra : rebase_source : 0d704f5a3edcbcef56d15b76ef26aae1b7232c4d