Send a message through the ozone channel to recreate buffers

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/host/drm_window_host.h"
 
 #include "base/bind.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/events/event.h"
 #include "ui/events/ozone/evdev/event_factory_evdev.h"
@@ skipping 170 matching lines @@
 void DrmWindowHost::OnChannelDestroyed() {
 }
 
 void DrmWindowHost::SendBoundsChange() {
   // Update the cursor before the window so that the cursor stays within the
   // window bounds when the window size shrinks.
   cursor_->CommitBoundsChange(widget_, bounds_, GetCursorConfinedBounds());
   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