exo: Recreate Surface resources on context lost.

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index e68752f8f9c473c02d83e23eb81cbeedbf48377c..3818e182dd6f5b34f272c09436627b22224ff5c5 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -112,6 +112,10 @@ InProcessContextFactory::~InProcessContextFactory() {
   DCHECK(per_compositor_data_.empty());
 }
 
+void InProcessContextFactory::SendOnLostResources() {
+  FOR_EACH_OBSERVER(ContextFactoryObserver, observer_list_, OnLostResources());
+}
+
 void InProcessContextFactory::CreateOutputSurface(
     base::WeakPtr<Compositor> compositor) {
   // Try to reuse existing shared worker context provider.