Implement aura::WindowPortMus::CreateCompositorFrameSink()

services/ui/ws/window_server.cc

Index: services/ui/ws/window_server.cc
diff --git a/services/ui/ws/window_server.cc b/services/ui/ws/window_server.cc
index 67b312547b4c89e727ca8c52d56a89c92c95000e..255e49c4ceae61b4110d2adcd9619ee175f73b8c 100644
--- a/services/ui/ws/window_server.cc
+++ b/services/ui/ws/window_server.cc
@@ -856,10 +856,9 @@ void WindowServer::OnSurfaceCreated(const cc::SurfaceInfo& surface_info) {
 
   HandleTemporaryReferenceForNewSurface(surface_info.id(), window);
 
-  if (!window->parent())
-    return;
-
-  WindowTree* window_tree = GetTreeWithId(window->parent()->id().client_id);
+  // We always use the client_id of window's id (even for embedded window),

[sky, 2017/05/26 23:14:18]

How about, 'We always use the owner of the window...'

[Peng, 2017/05/30 19:46:27]

Done.

+  // because an embedded window's id is allocated by the parent's window tree.
+  WindowTree* window_tree = GetTreeWithId(window->id().client_id);
   if (window_tree)
     window_tree->ProcessWindowSurfaceChanged(window, surface_info);
 }