Minor cleanups for SDK devsite docs.

native_client_sdk/src/doc/PRESUBMIT.py

+# Copyright (c) 2012 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.
+
+import subprocess
+
+def _CheckSphinxBuild(input_api, output_api):
+  """Check that the docs are buildable without any warnings.
+
+  This check runs sphinx-build with -W so that warning are errors.
+  """
+
+  try:
+    subprocess.check_output(['make', 'SPHINXOPTS=-Wa'])
+  except subprocess.CalledProcessError as e:
+    return [output_api.PresubmitPromptError('sphinx_build failed:\n' +
+            e.output)]
+
+  return []
+
+
+def CommonChecks(input_api, output_api):
+  output = []
+  output.extend(_CheckSphinxBuild(input_api, output_api))
+  return output
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return CommonChecks(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return CommonChecks(input_api, output_api)