[S.P.] Don't draw frames of animated images that are offscreen.

Source/core/layout/LayoutBoxModelObject.cpp

Index: Source/core/layout/LayoutBoxModelObject.cpp
diff --git a/Source/core/layout/LayoutBoxModelObject.cpp b/Source/core/layout/LayoutBoxModelObject.cpp
index 7f7e52dab4b00821c2d0e9d6cc0a33e551e49f5e..ee6b932bd7a3fddbe5e5b35f97bf8f4f80d70ee9 100644
--- a/Source/core/layout/LayoutBoxModelObject.cpp
+++ b/Source/core/layout/LayoutBoxModelObject.cpp
@@ -264,7 +264,12 @@ void LayoutBoxModelObject::invalidateTreeIfNeeded(const PaintInvalidationState&
     // ASSERT(&newPaintInvalidationContainer == containerForPaintInvalidation());
 
     PaintInvalidationReason reason = invalidatePaintIfNeeded(paintInvalidationState, newPaintInvalidationContainer);
-    clearPaintInvalidationState(paintInvalidationState);
+    if (reason != PaintInvalidationDelayedFull) {
+        clearPaintInvalidationState(paintInvalidationState);
+    } else {
+        // Mark this object as needing paint invalidation again in the next frame, due to the request for delayed paint invalidation.
+        setShouldDoFullPaintInvalidation();
+    }
 
     PaintInvalidationState childTreeWalkState(paintInvalidationState, *this, newPaintInvalidationContainer);
     if (reason == PaintInvalidationLocationChange)