c++ / mojo changes for 'external window mode'

services/ui/ws/window_tree.h

Index: services/ui/ws/window_tree.h
diff --git a/services/ui/ws/window_tree.h b/services/ui/ws/window_tree.h
index 6fc0a9667b579556948df487d0d4d49257b1f4bc..c105cfca2cde12a63a561f4cc721ab6219664cba 100644
--- a/services/ui/ws/window_tree.h
+++ b/services/ui/ws/window_tree.h
@@ -149,10 +149,16 @@ class WindowTree : public mojom::WindowTree,
   WindowServer* window_server() { return window_server_; }
   const WindowServer* window_server() const { return window_server_; }
 
+  // Calls WindowTreeClient::OnEmbed.
+  void DoOnEmbed(mojom::WindowTreePtr tree, ServerWindow* root);
+
   // Called from ~WindowServer. Reset WindowTreeClient so that it no longer gets
   // any messages.
   void PrepareForWindowServerShutdown();
 
+  // Adds a new root to this tree.
+  void AddRoot(const ServerWindow* root);
+
   // Adds a new root to this tree. This is only valid for window managers.
   void AddRootForWindowManager(const ServerWindow* root);