Send a message through the ozone channel to recreate buffers

ui/ozone/platform/drm/host/drm_window_host.cc

Index: ui/ozone/platform/drm/host/drm_window_host.cc
diff --git a/ui/ozone/platform/drm/host/drm_window_host.cc b/ui/ozone/platform/drm/host/drm_window_host.cc
index 4bf338507ba84aa94dfe1088cf28678e5ac53292..b1fd7b5b5f8a5327bd426dc8622e88e6bf1b8183 100644
--- a/ui/ozone/platform/drm/host/drm_window_host.cc
+++ b/ui/ozone/platform/drm/host/drm_window_host.cc
@@ -188,4 +188,30 @@ void DrmWindowHost::SendBoundsChange() {
   sender_->Send(new OzoneGpuMsg_WindowBoundsChanged(widget_, bounds_));
 }
 
+bool DrmWindowHost::OnMessageReceived(const IPC::Message& message) {
+  bool handled = true;
+
+  IPC_BEGIN_MESSAGE_MAP(DrmWindowHost, message)
+  IPC_MESSAGE_HANDLER(OzoneHostMsg_WindowMappingChanged, OnWindowMappingChanged)
+  IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+
+  return handled;
+}
+
+void DrmWindowHost::OnChannelEstablished(
+    int host_id,
+    scoped_refptr<base::SingleThreadTaskRunner> send_runner,
+    const base::Callback<void(IPC::Message*)>& send_callback) {
+}
+
+void DrmWindowHost::OnChannelDestroyed(int host_id) {
+}
+
+void DrmWindowHost::OnWindowMappingChanged(gfx::AcceleratedWidget widget) {
+  if (widget == widget_) {
+    ;
+  }
+}
+
 }  // namespace ui