Bug 1105011 - Include locale in tiles payload. r=rnewman

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extra : rebase_source : 0aae32abcad1292584560ed41ce38342f87eef96
Bug 1105011 - Update testDistribution to check for tiles locale. r=rnewman

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extra : rebase_source : 97dfca4d90d2303c3f51c0d6b6c4a814503d6142