[Chromecast] Fix crash on keypress in cast_shell with Ozone X11

ui/aura/window_targeter.cc

Index: ui/aura/window_targeter.cc
diff --git a/ui/aura/window_targeter.cc b/ui/aura/window_targeter.cc
index 1364ab3fb83ccce05ac450e98d83c664ef7cefcf..9853585d3cda3a6a0dddb1503f668abb4b34c7d5 100644
--- a/ui/aura/window_targeter.cc
+++ b/ui/aura/window_targeter.cc
@@ -107,6 +107,8 @@ Window* WindowTargeter::FindTargetForKeyEvent(Window* window,
                                               const ui::KeyEvent& key) {
   Window* root_window = window->GetRootWindow();
   client::FocusClient* focus_client = client::GetFocusClient(root_window);
+  if (!focus_client)
+    return window;

[sadrul, 2016/07/20 16:58:36]

Should this return nullptr?

[halliwell, 2016/07/20 17:01:42]

tbh I don't understand this code well.  But I was going by the line below, where
if the focus_client fails to GetFocusedWindow, this function will return
'window'.

   Window* focused_window = focus_client->GetFocusedWindow();
   if (!focused_window)
     return window;