| Index: cc/trees/layer_tree_impl.cc
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| diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
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| index d0d582ec14b051308657eefb4542e353c6477602..70d89a01900f1569aa6d09cbf321df89f3b0e9ed 100644
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| --- a/cc/trees/layer_tree_impl.cc
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| +++ b/cc/trees/layer_tree_impl.cc
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| @@ -425,6 +425,8 @@ void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
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|    target_tree->set_bottom_controls_height(bottom_controls_height_);
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|    target_tree->PushBrowserControls(nullptr);
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|  
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| +  target_tree->set_scroll_boundary_behavior(scroll_boundary_behavior_);
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| +
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|    // The page scale factor update can affect scrolling which requires that
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|    // these ids are set, so this must be before PushPageScaleFactorAndLimits.
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|    target_tree->SetViewportLayersFromIds(viewport_layer_ids_);
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| @@ -818,6 +820,11 @@ void LayerTreeImpl::set_bottom_controls_height(float bottom_controls_height) {
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|      host_impl_->UpdateViewportContainerSizes();
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|  }
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|  
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| +void LayerTreeImpl::set_scroll_boundary_behavior(
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| +    const ScrollBoundaryBehavior& behavior) {
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| +  scroll_boundary_behavior_ = behavior;
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| +}
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| +
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|  bool LayerTreeImpl::ClampBrowserControlsShownRatio() {
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|    float ratio = top_controls_shown_ratio_->Current(true);
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|    ratio = std::max(ratio, 0.f);
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| 
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