import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1181392 part 1 - Remove use of IsFinishedTransition from Animation::CanThrottle; r=dbaron (a1460a571)
- Bug 1181392 part 2 - Remove use of IsFinishedTransition from Animation::ComposeStyle; r=dbaron (69363e99a)
- Bug 1181392 part 3 - Remove use of IsFinishedTransition in KeyframeEffectReadOnly; r=dbaron (41b1dc12d)
- Bug 1181392 part 4 - Remove use of IsFinishedTransition from nsLayoutUtils; r=dbaron (4ce9c8a90)
- Bug 771367 - Refactor GetAnimationContent and GetAnimationCollection into CommonAnimationManager to hide atom and pseudo-element voodoo. r=bbirtles (699c8ae54)
- Bug 1181392 part 5 - Remove use of IsFinishedTransition from AnimationCollection::HasAnimationOfProperty; r=dbaron (fb261816f)
- Bug 1181392 part 6 - Remove use of IsFinishedTransition from nsTransitionManager::StyleContextChanged; r=dbaron (1a2241272)
- Bug 1181392 part 7 - Remove use of IsFinishedTransition from nsTransitionManager::ConsiderStartingTransition; r=dbaron (9b6e7f322)
- Bug 1181392 part 8 - Remove use of IsFinishedTransition from nsTransitionManager::PruneCompletedTransitions; r=dbaron (3f31365ac)
- Bug 1181392 part 9 - Remove use of IsFinishedTransition from nsTransitionManager::FlushTransitions; r=dbaron (77374c339)
- Bug 1181392 part 10 - Remove KeyframeEffect::IsFinishedTransition; r=dbaron (6db3a358b)
- Bug 1188251 part 1 - Remove transitions cleanup from FlushTransitions; r=dholbert (3c0da49eb)
- Bug 1188251 part 2 - Check if a tick can be throttled in FlushAnimations using Animation::CanThrottle; r=dholbert (a1bdf30da)
- Bug 1188251 part 3 - Add AnimationCollection::RequestRestyle; r=dholbert (9a4c3fc6d)
- Bug 1188251 part 4 - Move throttling checks to AnimationCollection::RequestRestyle; r=dholbert (da289d243)
- Bug 1188251 part 5 - Move some assertions from FlushTransitions to RequestRestyle; r=dholbert (e41698092)
- Bug 1188251 part 6 - Unify FlushAnimations and FlushTransitions; r=dholbert (2ac375897)
- Bug 1188251 part 7 - Move WillRefresh to CommonAnimationManager; r=dholbert (df81a5ce3)
- Bug 1188251 part 8 - Remove call to Animation::Tick from CheckAnimationRule; r=dholbert (c7a0409b7)
- Bug 1188251 part 9 - Request restyles from Animation::Tick; r=dholbert (d0695155c)
- Bug 1061364 - Don't force transitions to refresh their style rule; r=dbaron (d6c6003d4)
- remove restyle on refresh (85a3c522c)
- Bug 1188251 part 10 - Remove throttling from EnsureStyleRuleFor; r=dholbert (726ce1c87)
- Bug 1188251 part 11 - Add RestyleType::Layer; r=dholbert (c7602af18)
- Bug 1188251 part 12 - Use RestyleType::Layer in UpdateCascade; r=dholbert (3a7639c8d)

layout/base/nsPresShell.cpp

@@ -4025,7 +4025,7 @@ PresShell::FlushPendingNotifications(mozilla::ChangesToFlush aFlush)
         }
         if (mPresContext->TransitionManager()) {
           mPresContext->TransitionManager()->
-            FlushTransitions(CommonAnimationManager::Cannot_Throttle);
+            FlushAnimations(CommonAnimationManager::Cannot_Throttle);
         }
         mPresContext->TickLastStyleUpdateForAllAnimations();
       }