Add a yapf style to //build/chromeos/ and auto-format all python files.

Format all the things!

Change-Id: I33f02e6e21c4388f381b35e06394fb916bfddddd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891735
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711845}

build/chromeos/.style.yapf

+[style]
+based_on_style = chromium

build/chromeos/PRESUBMIT.py

 # Copyright (c) 2013 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.
-
 """Presubmit script for build/chromeos/.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts for
@@ -11,9 +10,7 @@ details on the presubmit API built into depot_tools.
 
 def CommonChecks(input_api, output_api):
   return input_api.canned_checks.RunPylint(
-      input_api,
-      output_api,
-      pylintrc='pylintrc')
+      input_api, output_api, pylintrc='pylintrc')
 
 
 def CheckChangeOnUpload(input_api, output_api):

build/chromeos/create_test_runner_script.py

@@ -3,7 +3,6 @@
 # Copyright 2018 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.
-
 """Creates a script that runs a CrOS VM test by delegating to
 build/chromeos/test_runner.py.
 """
@@ -12,7 +11,6 @@ import argparse
 import os
 import sys
 
-
 SCRIPT_TEMPLATE = """\
 #!/usr/bin/env python
 #
@@ -90,7 +88,8 @@ def main(args):
       vm_test_args.append('--deploy-chrome')
 
   vm_test_args += [
-      '--board', args.board,
+      '--board',
+      args.board,
       '-v',
   ]
   if args.use_vm:
@@ -100,17 +99,18 @@ def main(args):
       ('--cros-cache', RelativizePathToScript(args.cros_cache)),
   ]
   if args.runtime_deps_path:
-    vm_test_path_args.append(
-        ('--runtime-deps-path', RelativizePathToScript(args.runtime_deps_path)))
+    vm_test_path_args.append(('--runtime-deps-path',
+                              RelativizePathToScript(args.runtime_deps_path)))
   if args.output_directory:
-    vm_test_path_args.append(
-        ('--path-to-outdir', RelativizePathToScript(args.output_directory)))
+    vm_test_path_args.append(('--path-to-outdir',
+                              RelativizePathToScript(args.output_directory)))
 
   with open(args.script_output_path, 'w') as script:
-    script.write(SCRIPT_TEMPLATE.format(
-        vm_test_script=run_test_path,
-        vm_test_args=str(vm_test_args),
-        vm_test_path_args=str(vm_test_path_args)))
+    script.write(
+        SCRIPT_TEMPLATE.format(
+            vm_test_script=run_test_path,
+            vm_test_args=str(vm_test_args),
+            vm_test_path_args=str(vm_test_path_args)))
 
   os.chmod(args.script_output_path, 0750)