move some vd function from private to public.
modify VsyncObserver TickTask return value.
export VsyncDispatcherHelper.h
modify indent hint
add input dispatcher to vd framework
remove NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_MAIN_THREAD_DESTRUCTION from VsyncObserver
Bug 987529 - integrate CompositorParent into vsync dispatcher