Update android device provisioning script to set some reliability settings.

build/android/pylib/content_settings.py

+# Copyright (c) 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.
+
+
+class ContentSettings(dict):
+
+  """A dict interface to interact with device content settings.
+
+  System properties are key/value pairs as exposed by adb shell content.
+  """
+
+  def __init__(self, table, adb):
+    super(ContentSettings, self).__init__()
+    self._table = table
+    self._adb = adb
+
+  def _GetTypeBinding(self, value):
+    if isinstance(value, bool):
+      return 'b'
+    if isinstance(value, float):
+      return 'f'
+    if isinstance(value, int):
+      return 'i'
+    if isinstance(value, long):
+      return 'l'
+    if isinstance(value, str):
+      return 's'
+    raise ValueError('Unsupported type %s' % type(value))
+
+  def iteritems(self):
+    # Example row:
+    # 'Row: 0 _id=13, name=logging_id2, value=-1fccbaa546705b05'
+    for row in self._adb.RunShellCommandWithSU(
+        'content query --uri content://%s' % self._table):
+      fields = row.split(', ')
+      key = None
+      value = None
+      for field in fields:
+        k, _, v = field.partition('=')
+        if k == 'name':
+          key = v
+        elif k == 'value':
+          value = v
+      assert key, value
+      yield key, value
+
+  def __getitem__(self, key):
+    return self._adb.RunShellCommandWithSU(
+        'content query --uri content://%s --where "name=\'%s\'" '
+        '--projection value' % (self._table, key)).strip()
+
+  def __setitem__(self, key, value):
+    if key in self:
+      self._adb.RunShellCommandWithSU(
+          'content update --uri content://%s '
+          '--bind value:%s:%s --where "name=\'%s\'"' % (
+              self._table,
+              self._GetTypeBinding(value), value, key))
+    else:
+      self._adb.RunShellCommandWithSU(
+          'content insert --uri content://%s '
+          '--bind name:%s:%s --bind value:%s:%s' % (
+              self._table,
+              self._GetTypeBinding(key), key,
+              self._GetTypeBinding(value), value))
+
+  def __delitem__(self, key):
+    self._adb.RunShellCommandWithSU(
+        'content delete --uri content://%s '
+        '--bind name:%s:%s' % (
+            self._table,
+            self._GetTypeBinding(key), key))