[devil] Add an iteration timeout option to cmd_helper.IterCmdStdoutLines.

devil/docs/device_utils.md

 # [devil.android.device_utils](https://github.com/catapult-project/catapult/blob/master/devil/devil/android/device_utils.py)
 
 *This page was autogenerated by `devil/utils/markdown.py --module-link https://github.com/catapult-project/catapult/blob/master/devil/devil/android/device_utils.py`*
 
 ## DeviceUtils
 
 ### DeviceUtils.\_\_init\_\_
 
 DeviceUtils constructor.
 ```
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     Returns:
       A dict mapping process name to a list of PIDs for each process that
       contained the provided |process_name|.
 
     Raises:
       CommandTimeoutError on timeout.
       DeviceUnreachableError on missing device.
 ```
 
 
+### DeviceUtils.GetEnforce
+
+Get the current mode of SELinux.
+```
+    Args:
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Returns:
+      True (enforcing), False (permissive), or None (disabled).
+
+    Raises:
+      CommandFailedError on failure.
+      CommandTimeoutError on timeout.
+      DeviceUnreachableError on missing device.
+```
+
+
+### DeviceUtils.SetEnforce
+
+Modify the mode SELinux is running in.
+```
+    Args:
+      enabled: a boolean indicating whether to put SELinux in encorcing mode
+               (if True), or permissive mode (otherwise).
+      timeout: timeout in seconds
+      retries: number of retries
+
+    Raises:
+      CommandFailedError on failure.
+      CommandTimeoutError on timeout.
+      DeviceUnreachableError on missing device.
+```
+
+
 ### DeviceUtils.TakeScreenshot
 
 Takes a screenshot of the device.
 ```
     Args:
       host_path: A string containing the path on the host to save the
                  screenshot to. If None, a file name in the current
                  directory will be generated.
       timeout: timeout in seconds
       retries: number of retries
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 ### RestartServer
 
 Restarts the adb server.
 ```
   Raises:
     CommandFailedError if we fail to kill or restart the server.
 ```