View synchronization

mojo/services/public/cpp/view_manager/view_tree_node.h

Index: mojo/services/public/cpp/view_manager/view_tree_node.h
diff --git a/mojo/services/public/cpp/view_manager/view_tree_node.h b/mojo/services/public/cpp/view_manager/view_tree_node.h
index b2af9cb122140a17d0ab0d2a368a9ef3c8293b57..e1f90588eb5a4c976e2fe060f20d4b2e26f79f78 100644
--- a/mojo/services/public/cpp/view_manager/view_tree_node.h
+++ b/mojo/services/public/cpp/view_manager/view_tree_node.h
@@ -15,6 +15,7 @@ namespace mojo {
 namespace services {
 namespace view_manager {
 
+class View;
 class ViewManager;
 class ViewTreeNodeObserver;
 
@@ -50,6 +51,10 @@ class ViewTreeNode {
 
   ViewTreeNode* GetChildById(TransportNodeId id);
 
+  // View.
+  void SetActiveView(View* view);
+  View* active_view() { return active_view_; }
+
  protected:
   // This class is subclassed only by test classes that provide a public ctor.
   ViewTreeNode();
@@ -63,6 +68,7 @@ class ViewTreeNode {
   void LocalDestroy();
   void LocalAddChild(ViewTreeNode* child);
   void LocalRemoveChild(ViewTreeNode* child);
+  void LocalSetActiveView(View* view);
 
   ViewManager* manager_;
   TransportNodeId id_;
@@ -71,6 +77,8 @@ class ViewTreeNode {
 
   ObserverList<ViewTreeNodeObserver> observers_;
 
+  View* active_view_;
+
   DISALLOW_COPY_AND_ASSIGN(ViewTreeNode);
 };