exo: Recreate Surface resources on context lost.

ui/compositor/test/in_process_context_factory.h

Index: ui/compositor/test/in_process_context_factory.h
diff --git a/ui/compositor/test/in_process_context_factory.h b/ui/compositor/test/in_process_context_factory.h
index 525126021bfcaeb7ce39167941acb89347d80a52..3870f038b805a894f3cf30bec3a429a20629559b 100644
--- a/ui/compositor/test/in_process_context_factory.h
+++ b/ui/compositor/test/in_process_context_factory.h
@@ -41,6 +41,10 @@ class InProcessContextFactory : public ContextFactory {
     use_test_surface_ = use_test_surface;
   }
 
+  // This is used to call OnLostResources on all clients, to ensure they stop
+  // using the SharedMainThreadContextProvider.
+  void SendOnLostResources();
+
   // ContextFactory implementation
   void CreateOutputSurface(base::WeakPtr<Compositor> compositor) override;
 
@@ -63,6 +67,8 @@ class InProcessContextFactory : public ContextFactory {
   void SetAuthoritativeVSyncInterval(ui::Compositor* compositor,
                                      base::TimeDelta interval) override {}
   void SetOutputIsSecure(ui::Compositor* compositor, bool secure) override {}
+  void AddObserver(ContextFactoryObserver* observer) override;
+  void RemoveObserver(ContextFactoryObserver* observer) override;
 
  private:
   scoped_refptr<InProcessContextProvider> shared_main_thread_contexts_;
@@ -75,6 +81,7 @@ class InProcessContextFactory : public ContextFactory {
   bool use_test_surface_;
   bool context_factory_for_test_;
   cc::SurfaceManager* surface_manager_;
+  base::ObserverList<ContextFactoryObserver> observer_list_;
 
   base::hash_map<Compositor*, std::unique_ptr<cc::Display>>
       per_compositor_data_;