Run Iris examples on desktop and Android

src/lib.rs

@@ -27,6 +27,7 @@ mod access_tests;
 #[cfg(test)]
 mod layout_tests;
 
+pub use image;
 pub use iris_core as core;
 pub use iris_macro as macros;
 pub use iris_macro::app_init;

src/rsc/task.rs

@@ -14,6 +14,11 @@ use tokio::{
     },
 };
 
+/// Waits without blocking the task runtime's worker thread.
+pub async fn sleep(duration: std::time::Duration) {
+    tokio::time::sleep(duration).await;
+}
+
 /// What a completed task nudges when it wants its result drawn. Shared
 /// between backends rather than typed as `winit::window::Window` directly:
 /// android-view has no `Window` at all, and the redraw request there is a