Bug 1048624 - Re-enable media crashtests on Android and B2G.
Bug 1048628 - Skip 0-timescale.html on Android due to being perma-fail.
Bug 888557 - Skip 459439-1.html on Android for intermittent timeouts.
Bug 909925 - Skip 791330.html, 855796.html, and 863929.html on Android and B2G.
Bug 1048863 - Disable 1028458.html on Android and B2G.