[Ozone-DRI] Assume window IPC arrives before surface IPC

ui/ozone/platform/dri/dri_window.h

Index: ui/ozone/platform/dri/dri_window.h
diff --git a/ui/ozone/platform/dri/dri_window.h b/ui/ozone/platform/dri/dri_window.h
index cc6b9c54757f508ee88407d49f0ac603b0a7ca34..00d4e4a79b8ab65ae9100b24eef8a2f2a6f37d0b 100644
--- a/ui/ozone/platform/dri/dri_window.h
+++ b/ui/ozone/platform/dri/dri_window.h
@@ -22,6 +22,16 @@ class DriWindowManager;
 class EventFactoryEvdev;
 class DriGpuPlatformSupportHost;
 
+// Implementation of the platform window. This object and its handle |widget_|
+// uniquely identify a window. Since the DRI/GBM platform is split into 2
+// pieces (Browser process and GPU process), internally we need to make sure the
+// state is synchronized between the 2 processes.
+//
+// |widget_| is used in both processes to uniquely identify the window. This
+// means that any state on the browser side needs to be propagated to the GPU.
+// State propagation needs to happen before the state change is acknowledged to
+// |delegate_| as |delegate_| is responsible for initializing the surface
+// associated with the window (the surface is created on the GPU process).
 class DriWindow : public PlatformWindow,
                   public PlatformEventDispatcher,
                   public ChannelObserver {