Histograms.xml python script housekeeping

tools/metrics/histograms/print_style.py

 # Copyright 2014 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.
 
 """Holds the constants for pretty printing histograms.xml."""
 
 import os
 import sys
 
-# Import the metrics/common module for pretty print xml.
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'common'))
-import pretty_print_xml
+sys.path.append(os.path.join(os.path.dirname(__file__), '..'))  # tools/metrics
+from common import pretty_print_xml
 
 # Desired order for tag attributes; attributes listed here will appear first,
 # and in the same order as in these lists.
 # { tag_name: [attribute_name, ...] }
 ATTRIBUTE_ORDER = {
   'enum': ['name', 'type'],
   'histogram': ['name', 'enum', 'units'],
   'int': ['value', 'label'],
   'histogram_suffixes': ['name', 'separator', 'ordering'],
   'suffix': ['name', 'label'],
@@ skipping 28 matching lines @@
   'owner',
 ]
 
 
 def GetPrintStyle():
   """Returns an XmlStyle object for pretty printing histograms."""
   return pretty_print_xml.XmlStyle(ATTRIBUTE_ORDER,
                                    TAGS_THAT_HAVE_EXTRA_NEWLINE,
                                    TAGS_THAT_DONT_INDENT,
                                    TAGS_THAT_ALLOW_SINGLE_LINE)