DeviceUtils.ForceStop: no-op if the app isn't running

build/android/devil/android/device_utils.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Provides a variety of device interactions based on adb.
 
 Eventually, this will be based on adb_wrapper.
 """
 # pylint: disable=unused-argument
 
@@ skipping 991 matching lines @@
 
     Args:
       package: A string containing the name of the package to stop.
       timeout: timeout in seconds
       retries: number of retries
 
     Raises:
       CommandTimeoutError on timeout.
       DeviceUnreachableError on missing device.
     """
-    self.RunShellCommand(['am', 'force-stop', package], check_return=True)
+    cmd = 'p=%s;if [[ "$(ps)" = *$p* ]]; then am force-stop $p; fi'
+    self.RunShellCommand(cmd % package, check_return=True)
 
   @decorators.WithTimeoutAndRetriesFromInstance()
   def ClearApplicationState(
       self, package, permissions=None, timeout=None, retries=None):
     """Clear all state for the given package.
 
     Args:
       package: A string containing the name of the package to stop.
       permissions: List of permissions to set after clearing data.
       timeout: timeout in seconds
@@ skipping 1033 matching lines @@
     if ('android.permission.WRITE_EXTERNAL_STORAGE' in permissions
         and 'android.permission.READ_EXTERNAL_STORAGE' not in permissions):
       permissions.append('android.permission.READ_EXTERNAL_STORAGE')
     cmd = ';'.join('pm grant %s %s' %(package, p) for p in permissions)
     if cmd:
       output = self.RunShellCommand(cmd)
       if output:
         logging.warning('Possible problem when granting permissions. Blacklist '
                         'may need to be updated.')
         logging.warning(output)