controller.py/service.py: Add and use the --force with Delete endpoint.

BUG=chromium:1095661
TEST=manual, run_tests

Change-Id: I1d2118222ae6f86607304ad24705c72abed97543
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2278108
Commit-Queue: Michael Mortensen <mmortensen@google.com>
Tested-by: Michael Mortensen <mmortensen@google.com>
Reviewed-by: Alex Klein <saklein@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/api/controller/sdk.py b/api/controller/sdk.py
index dac9388..ccf3ee6 100644
--- a/api/controller/sdk.py
+++ b/api/controller/sdk.py
@@ -101,7 +101,7 @@
 def Delete(input_proto, _output_proto, _config):
   """Delete a chroot."""
   chroot = controller_util.ParseChroot(input_proto.chroot)
-  sdk.Delete(chroot)
+  sdk.Delete(chroot, force=True)
 
 
 @faux.all_empty
diff --git a/service/sdk.py b/service/sdk.py
index 6ed1bf6..ca9eef7 100644
--- a/service/sdk.py
+++ b/service/sdk.py
@@ -169,16 +169,19 @@
   return GetChrootVersion(arguments.chroot_path)
 
 
-def Delete(chroot=None):
+def Delete(chroot=None, force=False):
   """Delete the chroot.
 
   Args:
     chroot (chroot_lib.Chroot): The chroot being deleted, or None for the
       default chroot.
+    force: Boolean that applies the --force option.
   """
   # Delete the chroot itself.
   logging.info('Removing the SDK.')
   cmd = [os.path.join(constants.CHROMITE_BIN_DIR, 'cros_sdk'), '--delete']
+  if force:
+    cmd.extend(['--force'])
   if chroot:
     cmd.extend(['--chroot', chroot.path])
 
diff --git a/service/sdk_unittest.py b/service/sdk_unittest.py
index b62b27e..cf430ee 100644
--- a/service/sdk_unittest.py
+++ b/service/sdk_unittest.py
@@ -122,6 +122,12 @@
     sdk.Delete(chroot=chroot_lib.Chroot(path))
     self.assertCommandContains(['--delete', '--chroot', path])
 
+  def testDeleteWithChrootAndForce(self):
+    """Test with chroot and force provided."""
+    path = '/some/path'
+    sdk.Delete(chroot=chroot_lib.Chroot(path), force=True)
+    self.assertCommandContains(['--delete', '--force', '--chroot', path])
+
 
 class UpdateTest(cros_test_lib.RunCommandTestCase):
   """Update function tests."""