Implement aura::WindowPortMus::CreateCompositorFrameSink()

services/ui/ws/window_tree.cc

Index: services/ui/ws/window_tree.cc
diff --git a/services/ui/ws/window_tree.cc b/services/ui/ws/window_tree.cc
index 421b1972ee5788f2ba37a7eb021086b3dbcb1a52..ce04ab1cf1e9261310cc256940a452dd298f4dff 100644
--- a/services/ui/ws/window_tree.cc
+++ b/services/ui/ws/window_tree.cc
@@ -961,14 +961,9 @@ void WindowTree::ProcessTransientWindowRemoved(
 void WindowTree::ProcessWindowSurfaceChanged(
     ServerWindow* window,
     const cc::SurfaceInfo& surface_info) {
-  ServerWindow* parent_window = window->parent();
-  ClientWindowId client_window_id, parent_client_window_id;
-  if (!IsWindowKnown(window, &client_window_id) ||
-      !IsWindowKnown(parent_window, &parent_client_window_id) ||
-      !created_window_map_.count(parent_window->id())) {
+  ClientWindowId client_window_id;
+  if (!IsWindowKnown(window, &client_window_id))

[Fady Samuel, 2017/05/18 20:02:01]

Well, I think the conditions below are still valid if the window has a parent,
right?

[Peng, 2017/05/18 20:50:59]

With this change, the client can start submitting frames before adding it to a
parent window. And exo does it.

     return;
-  }
-
   client()->OnWindowSurfaceChanged(client_window_id.id, surface_info);
 }