Makes host driven tests use the common sharder.

build/android/pylib/uiautomator/dispatch.py

Index: build/android/pylib/uiautomator/dispatch.py
diff --git a/build/android/pylib/uiautomator/dispatch.py b/build/android/pylib/uiautomator/dispatch.py
index fafb2ac7ccf8360292effe1d1200f9d8a58a2645..349958859a4f52705c1eeb9513f71dc947958440 100644
--- a/build/android/pylib/uiautomator/dispatch.py
+++ b/build/android/pylib/uiautomator/dispatch.py
@@ -2,7 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-"""Dispatches the uiautomator tests."""
+"""Runs the uiautomator tests."""
 
 import logging
 import os
@@ -17,8 +17,8 @@ import test_package
 import test_runner
 
 
-def Dispatch(options):
-  """Dispatches uiautomator tests onto connected device(s).
+def RunUIAutomatorTests(options):
+  """Runs uiautomator tests on connected device(s).
 
   If possible, this method will attempt to shard the tests to
   all connected devices. Otherwise, dispatch and run tests on one device.
@@ -40,18 +40,9 @@ def Dispatch(options):
     logging.error('No uiautomator tests to run with current args.')
     return (base_test_result.TestRunResults(), constants.ERROR_EXIT_CODE)
 
-  attached_devices = android_commands.GetAttachedDevices()
-  if not attached_devices:
-    raise Exception('There are no devices online.')
-
-  if options.test_device:
-    assert options.test_device in attached_devices
-    attached_devices = [options.test_device]
-
   def TestRunnerFactory(device, shard_index):
     return test_runner.TestRunner(
         options, device, shard_index, test_pkg, [])
 
-  return shard.ShardAndRunTests(TestRunnerFactory, attached_devices,
-                                tests, options.build_type,
-                                num_retries=options.num_retries)
+  return dispatch.Dispatch(options, tests, TestRunnerFactory,
+                           distribution='shard')