Animated scroll shouldn't consume unhandled scrolls for OOPIFs.

cc/trees/layer_tree_settings.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TREES_LAYER_TREE_SETTINGS_H_
 #define CC_TREES_LAYER_TREE_SETTINGS_H_
 
 #include <stddef.h>
 
 #include <vector>
@@ skipping 92 matching lines @@
   // If set to true, the compositor may selectively defer image decodes to the
   // Image Decode Service and raster tiles without images until the decode is
   // ready.
   bool enable_checker_imaging = false;
 
   LayerTreeDebugState initial_debug_state;
 
   // Indicates that the LayerTreeHost should defer commits unless it has a valid
   // LocalSurfaceId set.
   bool enable_surface_synchronization = false;
+
+  // Indicates the case when a sub-frame gets its own LayerTree because it's
+  // rendered in a different process from its ancestor frames.
+  bool is_layer_tree_for_subframe = false;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_SETTINGS_H_