Open-source histograms.xml, starting with Autofill histograms.

tools/metrics/histograms/PRESUBMIT.py

+# Copyright 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.
+
+"""
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details on the presubmit API built into gcl.
+"""
+
+
+def CheckChange(input_api, output_api):
+  """Checks that histograms.xml is pretty-printed and well-formatted."""
+  for f in input_api.AffectedTextFiles():
+    p = f.AbsoluteLocalPath()
+    if (input_api.basename(p) == 'histograms.xml'
+        and input_api.os_path.dirname(p) == input_api.PresubmitLocalPath()):
+      cwd = input_api.os_path.dirname(p)
+      exit_code = input_api.subprocess.call(
+          ['python', 'pretty_print.py', '--presubmit'], cwd=cwd)
+      if exit_code != 0:
+        return [output_api.PresubmitError(
+            'histograms.xml is not formatted correctly; run pretty_print.py '
+            'to fix')]
+
+      exit_code = input_api.subprocess.call(
+          ['python', 'validate_format.py'], cwd=cwd)
+      if exit_code != 0:
+        return [output_api.PresubmitError(
+            'histograms.xml is not well formatted; run update_descriptions.py '
+            'and fix the reported errors')]
+  return []
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return CheckChange(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return CheckChange(input_api, output_api)