compositor-worker: cc->blink mutation plumbing

components/html_viewer/web_layer_tree_view_impl.h

Index: components/html_viewer/web_layer_tree_view_impl.h
diff --git a/components/html_viewer/web_layer_tree_view_impl.h b/components/html_viewer/web_layer_tree_view_impl.h
index bcd833ba7a958c6d56ad1fbe7831b6b9fd31e7ce..1058d9a38e0395b8e7ca2706934a94aaa96b21c7 100644
--- a/components/html_viewer/web_layer_tree_view_impl.h
+++ b/components/html_viewer/web_layer_tree_view_impl.h
@@ -58,6 +58,7 @@ class WebLayerTreeViewImpl : public blink::WebLayerTreeView,
                            const gfx::Vector2dF& elastic_overscroll_delta,
                            float page_scale,
                            float top_controls_delta) override;
+  void ApplyMutations(const cc::LayerTreeMutations& mutations) override {}
   void RequestNewOutputSurface() override;
   void DidFailToInitializeOutputSurface() override;
   void DidInitializeOutputSurface() override;