Set focusibility correctly when initializing a window in mus+ash.

ui/aura/mus/window_tree_client.cc

Index: ui/aura/mus/window_tree_client.cc
diff --git a/ui/aura/mus/window_tree_client.cc b/ui/aura/mus/window_tree_client.cc
index d5cef1fae1c448b7cc621187bf7ab32de56a5eb9..f0b90e87191c91fb96c0fa7f7ce1a4d8127a508c 100644
--- a/ui/aura/mus/window_tree_client.cc
+++ b/ui/aura/mus/window_tree_client.cc
@@ -1449,6 +1449,10 @@ void WindowTreeClient::WmCreateTopLevelWindow(
     window_manager_internal_client_->OnWmCreatedTopLevelWindow(
         change_id, WindowMus::Get(window)->server_id());
   }
+  auto activatable_iter =

[sky, 2017/01/23 21:28:29]

The WindowManagerDelegate should be responsible for applying this, not the
windowtreeclient. To do it here means all clients want to honor the property,
some may not.

[Hadi, 2017/01/24 18:42:32]

Done. Implementation of WindowManagerDelegate::OnWmCreateTopLevelWindow() calls
into CreateAndParentTopLevelWindow(). So moved it there.

+      properties.find(ui::mojom::WindowManager::kActivatable_InitProperty);
+  if (activatable_iter != properties.end())
+    SetCanFocus(window, mojo::ConvertTo<bool>(activatable_iter->second));
 }
 
 void WindowTreeClient::WmClientJankinessChanged(ClientSpecificId client_id,