Unfortunately, in-process plugins using OpenGL break the assumption made by these patches, that the current GL context is only changed by GLContext::MakeCurrent. Another issue, regardless of in-process, is that our host-side code in nsCoreAnimationSupport.mm uses direct CGL calls, bypassing GLContext.
This patch should improve performance of the robustness timer by not resetting
it each time a draw operation happens. It still checks if there's any activity
and, if not, it will stop firing it. It includes a single extra timer firing
after activity dies to make sure we don't miss anything. Also includes a fix for
robustness being marked as existing when it really isn't.
