Reformat docstrings and imports

Change-Id: Ie96a21779000a67c272f5e06d2bc11a64b4883f5
Bug: b:185520494

.style.yapf

@@ -0,0 +1,2 @@
+[style]
+based_on_style = chromium

PRESUBMIT.py

@@ -34,6 +34,7 @@ details on the presubmit API built into depot_tools.
 """
 
 import subprocess2
+
 USE_PYTHON3 = True
 _INCLUDE_MAN_FILES_ONLY = [r"man/.+\.1$"]
 _LIBWEBP_MAX_LINE_LENGTH = 80
@@ -44,14 +45,11 @@ def _RunManCmd(input_api, output_api, man_file):
   cmd = ["man", "--warnings", "-EUTF-8", "-l", "-Tutf8", "-Z", man_file]
   name = "Check %s file." % man_file
   start = input_api.time.time()
-    output, _ = subprocess2.communicate(cmd,
-                                        stdout=None,
-                                        stderr=subprocess2.PIPE,
-                                        universal_newlines=True)
+  output, _ = subprocess2.communicate(
+      cmd, stdout=None, stderr=subprocess2.PIPE, universal_newlines=True)
   duration = input_api.time.time() - start
   if output[1]:
-        return output_api.PresubmitError(
-            "%s\n%s (%4.2fs) failed\n%s" %
+    return output_api.PresubmitError("%s\n%s (%4.2fs) failed\n%s" %
                                      (name, " ".join(cmd), duration, output[1]))
   return output_api.PresubmitResult("%s\n%s (%4.2fs)\n" %
                                     (name, " ".join(cmd), duration))
@@ -63,8 +61,7 @@ def _CheckManFiles(input_api, output_api):
   man_sources = lambda x: input_api.FilterSourceFile(
       x, files_to_check=_INCLUDE_MAN_FILES_ONLY, files_to_skip=None)
 
-    affected_man_files = input_api.change.AffectedFiles(
-        file_filter=man_sources)
+  affected_man_files = input_api.change.AffectedFiles(file_filter=man_sources)
   results = [
       _RunManCmd(input_api, output_api, man_file.AbsoluteLocalPath())
       for man_file in affected_man_files