Make up missing getters and metrics; Update VLC scripts; Start to work on Chrome, update examples instructions

desktop_env/evaluators/getters/info.py

@@ -0,0 +1,20 @@
+import os
+from typing import Union
+
+
+def get_vm_screen_size(env, config: dict) -> dict:
+    return env.controller.get_vm_screen_size()
+
+
+def get_vm_window_size(env, config: dict) -> dict:
+    return env.controller.get_vm_window_size(app_class_name=config["app_class_name"])
+
+
+def get_vm_wallpaper(env, config: dict) -> Union[str, bytes]:
+    _path = os.path.join(env.cache_dir, config["dest"])
+
+    content = env.controller.get_vm_wallpaper()
+    with open(_path, "wb") as f:
+        f.write(content)
+
+    return _path