Rename "tree of trees" to "composed tree".

third_party/WebKit/Source/core/events/EventPath.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 139 matching lines @@
 
     m_nodeEventContexts.reserveCapacity(nodesInPath.size());
     for (Node* nodeInPath : nodesInPath) {
         m_nodeEventContexts.append(NodeEventContext(nodeInPath, eventTargetRespectingTargetRules(*nodeInPath)));
     }
 }
 
 void EventPath::calculateTreeOrderAndSetNearestAncestorClosedTree()
 {
     // Precondition:
-    //   - TreeScopes in m_treeScopeEventContexts must be *connected* in the same tree of trees.
+    //   - TreeScopes in m_treeScopeEventContexts must be *connected* in the same composed tree.
     //   - The root tree must be included.
     WillBeHeapHashMap<RawPtrWillBeMember<const TreeScope>, RawPtrWillBeMember<TreeScopeEventContext>> treeScopeEventContextMap;
     for (const auto& treeScopeEventContext : m_treeScopeEventContexts)
         treeScopeEventContextMap.add(&treeScopeEventContext->treeScope(), treeScopeEventContext.get());
     TreeScopeEventContext* rootTree = nullptr;
     for (const auto& treeScopeEventContext : m_treeScopeEventContexts) {
         // Use olderShadowRootOrParentTreeScope here for parent-child relationships.
         // See the definition of trees of trees in the Shadow DOM spec:
         // http://w3c.github.io/webcomponents/spec/shadow/
         TreeScope* parent = treeScopeEventContext.get()->treeScope().olderShadowRootOrParentTreeScope();
@@ skipping 208 matching lines @@
 #if ENABLE(OILPAN)
     visitor->trace(m_nodeEventContexts);
     visitor->trace(m_node);
     visitor->trace(m_event);
     visitor->trace(m_treeScopeEventContexts);
     visitor->trace(m_windowEventContext);
 #endif
 }
 
 } // namespace blink