Bug 919208 - Rewrite test_bug668513.html to run in its own window so that it won't be able to navigate the test runner frame back. r=bzbarsky, a=test-only

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rename : docshell/test/test_bug668513.html => docshell/test/file_bug668513.html
Bug 990202 - Move the test page to a new window to prevent it from navigating the test runner frame back. r=bzbarsky, a=test-only
Bug 912627 - Remove spurious assertion. r=cpearce, a=bajaj
Bug 947227 - Stop using SurfaceStream_TripleBuffer_Async since it can hang if the compositor fails to pull the latest surface. r=jgilbert, a=bajaj
Bug 947227 - Remove SurfaceStream_TripleBuffer_Async since it no longer has any users. r=jgilbert, a=bajaj
Bug 975955 - Hold a cpu wakelock while playing video. r=roc, a=bajaj