Send a message through the ozone channel to recreate buffers

content/common/gpu/media/rendering_helper.cc

Index: content/common/gpu/media/rendering_helper.cc
diff --git a/content/common/gpu/media/rendering_helper.cc b/content/common/gpu/media/rendering_helper.cc
index 26d91244a6e53e8aed72c71b62abccd14445681b..0d183dc0c17eb7c2dde0263a6d786f428306f395 100644
--- a/content/common/gpu/media/rendering_helper.cc
+++ b/content/common/gpu/media/rendering_helper.cc
@@ -123,6 +123,8 @@ class RenderingHelper::StubOzoneDelegate : public ui::PlatformWindowDelegate {
 
   void OnActivationChanged(bool active) override {};
 
+  void OnChangedSurface() override {}
+
   gfx::AcceleratedWidget accelerated_widget() const {
     return accelerated_widget_;
   }