Make compositingState explicit

Source/core/page/animation/AnimationBase.cpp

Index: Source/core/page/animation/AnimationBase.cpp
diff --git a/Source/core/page/animation/AnimationBase.cpp b/Source/core/page/animation/AnimationBase.cpp
index 40b7483e7a68984ee4f74cbe7466fefbcea145de..03ca1364b98648787f64ab384f02f4954391b915 100644
--- a/Source/core/page/animation/AnimationBase.cpp
+++ b/Source/core/page/animation/AnimationBase.cpp
@@ -555,8 +555,9 @@ void AnimationBase::freezeAtTime(double t)
     else
         m_pauseTime = m_startTime + t - m_animation->delay();
 
-    // It is possible that m_isAccelerated is true and m_object->isComposited() is false, because of style change.
-    if (m_object && m_object->isComposited() && isAccelerated())
+    // It is possible that m_isAccelerated is true and m_object->compositingState() is NotComposited, because of style change.
+    // So, both conditions need to be checked.
+    if (m_object && m_object->compositingState() == PaintsIntoOwnBacking && isAccelerated())
         toRenderBoxModelObject(m_object)->suspendAnimations(m_pauseTime);
 }