save and restore layers image when context is lost in Android

engine/layout.cpp

@@ -612,3 +612,15 @@ bool LayoutManager::reload()
      std::string path_copy = m_path;
      return load(path_copy.c_str());
 }
+
+void LayoutManager::restore_context()
+{
+    for (auto& node : m_layouts)
+        node.second->restore_context();
+}
+
+void LayoutManager::clear_context()
+{
+    for (auto& node : m_layouts)
+        node.second->clear_context();
+}