[android] Upstream / sync most of build/android and build/android/pylib.

build/android/pylib/io_stats_parser.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.
+
+"""Provides an interface to communicate with the device via the adb command.
+
+Assumes adb binary is currently on system path.
+"""
+
+
+import collections
+
+
+def ParseIoStatsLine(line):
+  """Parses a line of io stats into a IoStats named tuple."""
+  # Field definitions: http://www.kernel.org/doc/Documentation/iostats.txt
+  IoStats = collections.namedtuple('IoStats',
+                                   ['device',
+                                    'num_reads_issued',
+                                    'num_reads_merged',
+                                    'num_sectors_read',
+                                    'ms_spent_reading',
+                                    'num_writes_completed',
+                                    'num_writes_merged',
+                                    'num_sectors_written',
+                                    'ms_spent_writing',
+                                    'num_ios_in_progress',
+                                    'ms_spent_doing_io',
+                                    'ms_spent_doing_io_weighted',
+                                    ])
+  fields = line.split()
+  return IoStats._make([fields[2]] + [int(f) for f in fields[3:]])