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

desktop_env/envs/desktop_env.py

@@ -35,7 +35,10 @@ def _execute_command(command: List[str]) -> None:
 
 
 class DesktopEnv(gym.Env):
-    """DesktopEnv with OpenAI Gym interface."""
+    """
+    DesktopEnv with OpenAI Gym interface.
+    Fixme: refactor the logic when implementing the multi-process version
+    """
 
     def __init__(
             self,
@@ -81,6 +84,10 @@ class DesktopEnv(gym.Env):
         self.controller = PythonController(http_server=self.host)
         self.setup_controller = SetupController(http_server=self.host, cache_dir=self.cache_dir)
 
+        # Meta info of the VM
+        self.vm_platform = self.controller.get_vm_platform()
+        self.vm_screen_size = self.controller.get_vm_screen_size()
+
         # mode: human or machine
         assert action_space in ["computer_13", "pyautogui"]
         self.action_space = action_space