Paint invisible layer content in presence of composited animations.

third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h

Index: third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
index 265f63fee149434f61c5db343ea37d5ee176f8ac..1a525b80f8680c88ceb9737774594b97674d8a8a 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/TransformPaintPropertyNode.h
@@ -100,6 +100,10 @@ class PLATFORM_EXPORT TransformPaintPropertyNode
     return m_directCompositingReasons != CompositingReasonNone;
   }
 
+  bool requiresCompositingForAnimation() const {
+    return m_directCompositingReasons & CompositingReasonActiveAnimation;
+  }
+
   const CompositorElementId& compositorElementId() const {
     return m_compositorElementId;
   }