Tweaks to ViewManager:

mojo/services/view_manager/node.cc

Index: mojo/services/view_manager/node.cc
diff --git a/mojo/services/view_manager/node.cc b/mojo/services/view_manager/node.cc
index 49d9376b631022d4c930a44874f58aaa8cc0f5b0..21b3b5cab7daf937cdf1d22100c8ed9a7de1e3b9 100644
--- a/mojo/services/view_manager/node.cc
+++ b/mojo/services/view_manager/node.cc
@@ -40,7 +40,7 @@ Node::~Node() {
   SetView(NULL);
 }
 
-Node* Node::GetParent() {
+const Node* Node::GetParent() const {
   if (!window_.parent())
     return NULL;
   return window_.parent()->GetProperty(kNodeKey);
@@ -54,6 +54,13 @@ void Node::Remove(Node* child) {
   window_.RemoveChild(&child->window_);
 }
 
+const Node* Node::GetRoot() const {
+  const aura::Window* window = &window_;
+  while (window && window->parent())
+    window = window->parent();
+  return window->GetProperty(kNodeKey);
+}
+
 std::vector<Node*> Node::GetChildren() {
   std::vector<Node*> children;
   children.reserve(window_.children().size());
@@ -62,6 +69,10 @@ std::vector<Node*> Node::GetChildren() {
   return children;
 }
 
+bool Node::Contains(const Node* node) const {
+  return node && window_.Contains(&(node->window_));
+}
+
 void Node::SetView(View* view) {
   if (view == view_)
     return;