Send a message through the ozone channel to recreate buffers

ui/ozone/demo/ozone_demo.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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_vector.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 136 matching lines @@
   }
   void OnCloseRequest() override { Quit(); }
   void OnClosed() override {}
   void OnWindowStateChanged(ui::PlatformWindowState new_state) override {}
   void OnLostCapture() override {}
   void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget) override {
     DCHECK_NE(widget, gfx::kNullAcceleratedWidget);
     widget_ = widget;
   }
   void OnActivationChanged(bool active) override {}
+  void OnChangedSurface() override {}
 
  private:
   // Since we pretend to have a GPU process, we should also pretend to
   // initialize the GPU resources via a posted task.
   void StartOnGpu() {
     renderer_ =
         renderer_factory_->CreateRenderer(GetAcceleratedWidget(), GetSize());
     if (renderer_->Initialize()) {
       timer_.Start(FROM_HERE,
                    base::TimeDelta::FromMilliseconds(kFrameDelayMilliseconds),
@@ skipping 172 matching lines @@
       ->SetCurrentLayoutByName("us");
 
   base::RunLoop run_loop;
 
   WindowManager window_manager(run_loop.QuitClosure());
 
   run_loop.Run();
 
   return 0;
 }