[Android] Convert RestartAdbd to DeviceUtils again.

build/android/pylib/device/device_utils.py

Index: build/android/pylib/device/device_utils.py
diff --git a/build/android/pylib/device/device_utils.py b/build/android/pylib/device/device_utils.py
index 2d9671d01034f64873c5c0ebd2b889f0e896703c..8090b9a0b9ad5ff7a9cd13e1d52c327d6c58efab 100644
--- a/build/android/pylib/device/device_utils.py
+++ b/build/android/pylib/device/device_utils.py
@@ -76,6 +76,16 @@ _CONTROL_CHARGING_COMMANDS = [
   },
 ]
 
+_RESTART_ADBD_SCRIPT = """
+  trap '' HUP
+  trap '' TERM
+  trap '' PIPE
+  function restart() {
+    stop adbd
+    start adbd
+  }
+  restart &
+"""
 
 _CURRENT_FOCUS_CRASH_RE = re.compile(
     r'\s*mCurrentFocus.*Application (Error|Not Responding): (\S+)}')
@@ -1804,3 +1814,10 @@ class DeviceUtils(object):
 
     return [cls(adb) for adb in adb_wrapper.AdbWrapper.Devices()
             if not blacklisted(adb)]
+
+  @decorators.WithTimeoutAndRetriesFromInstance()
+  def RestartAdbd(self, timeout=None, retries=None):

[jbudorick, 2015/08/07 22:02:42]

This should have a device_test.

[rnephew (Reviews Here), 2015/08/07 22:42:11]

Done.

+    with device_temp_file.DeviceTempFile(self.adb, suffix='.sh') as script:
+      self.WriteFile(script.name, _RESTART_ADBD_SCRIPT)
+      self.RunShellCommand(['source', script.name], as_root=True)
+    self.adb.WaitForDevice()