Add GetSharedPrefs to Android platform

telemetry/telemetry/internal/platform/android_platform_backend.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.
 
 import logging
 import os
 import posixpath
 import re
 import subprocess
 import tempfile
@@ skipping 21 matching lines @@
 psutil = external_modules.ImportOptionalModule('psutil')
 import adb_install_cert
 
 from devil.android import app_ui
 from devil.android import battery_utils
 from devil.android import device_errors
 from devil.android import device_utils
 from devil.android.perf import cache_control
 from devil.android.perf import perf_control
 from devil.android.perf import thermal_throttle
+from devil.android.sdk import shared_prefs
 from devil.android.sdk import version_codes
 from devil.android.tools import video_recorder
 
 try:
   # devil.android.forwarder uses fcntl, which doesn't exist on Windows.
   from devil.android import forwarder
 except ImportError:
   forwarder = None
 
 try:
@@ skipping 78 matching lines @@
     return self._device
 
   def Initialize(self):
     self.EnsureBackgroundApkInstalled()
 
   def GetSystemUi(self):
     if self._system_ui is None:
       self._system_ui = app_ui.AppUi(self.device, 'com.android.systemui')
     return self._system_ui
 
+  def GetSharedPrefs(self, package, filename):
+    """Creates a Devil SharedPrefs instance.
+
+    See devil.android.sdk.shared_prefs for the documentation of the returned
+    object.
+
+    Args:
+      package: A string containing the package of the app that the SharedPrefs
+          instance will be for.
+      filename: A string containing the specific settings file of the app that
+          the SharedPrefs instance will be for.
+
+    Returns:
+      A reference to a SharedPrefs object for the given package and filename
+      on whatever device the platform backend has a reference to.
+    """
+    return shared_prefs.SharedPrefs(self._device, package, filename)
+
   def IsSvelte(self):
     description = self._device.GetProp('ro.build.description', cache=True)
     if description is not None:
       return 'svelte' in description
     return False
 
   def IsAosp(self):
     description = self._device.GetProp('ro.build.description', cache=True)
     if description is not None:
       return 'aosp' in description
@@ skipping 672 matching lines @@
   for process in psutil.process_iter():
     try:
       if psutil.version_info >= (2, 0):
         if 'adb' in process.name():
           process.cpu_affinity([0])
       else:
         if 'adb' in process.name:
           process.set_cpu_affinity([0])
     except (psutil.NoSuchProcess, psutil.AccessDenied):
       logging.warn('Failed to set adb process CPU affinity')