Makes host driven tests use the common sharder.

build/android/pylib/dispatch.py

Index: build/android/pylib/dispatch.py
diff --git a/build/android/pylib/dispatch.py b/build/android/pylib/dispatch.py
new file mode 100644
index 0000000000000000000000000000000000000000..03f15121b911c7166f00f84413cc7fc313ca0a3f
--- /dev/null
+++ b/build/android/pylib/dispatch.py
@@ -0,0 +1,65 @@
+# Copyright (c) 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.
+
+"""Common dispatcher for all test types."""
+
+import logging
+
+from pylib import android_commands
+from pylib.base import shard
+
+
+VALID_SHARDING_OPTIONS = ['shard', 'replicate']
+
+
+def Dispatch(options, tests, test_runner_factory, distribution='shard',
+             setup_timeout=None):
+  """Dispatches a particular set of tests.
+
+  This is a common function used by all test dispatchers.
+
+  Args:
+    options: command line options.
+    tests: a list of tests.
+    test_runner_factory: a function which accepts (device, shard_index) and
+        returns the test runner that the sharder uses to run tests.
+    distribution: a string to indicate whether we should distribute all tests as
+        a common pool to draw from, or duplicate all tests onto every test
+        runner. Must be either 'shard' or 'replicate'
+    setup_timeout: timeout for setup.
+
+  Returns:
+    A tuple of (base_test_result.TestRunResults object, exit code)
+  """
+
+  # Validation
+  if distribution not in VALID_SHARDING_OPTIONS:
+    raise ValueError('Invalid value for sharding. Options are: %s'
+                     % ', '.join(VALID_SHARDING_OPTIONS))
+
+  # Device setup
+  attached_devices = []
+
+  attached_devices = android_commands.GetAttachedDevices()
+  if options.test_device:
+    assert options.test_device in attached_devices
+    attached_devices = [options.test_device]
+
+  options.ensure_value('wait_for_debugger', False)
+  if len(attached_devices) > 1 and options.wait_for_debugger:
+    logging.warning('Debugger can not be sharded, using first available device')
+    attached_devices = attached_devices[:1]
+
+  if distribution == 'shard':
+    test_results, exit_code = shard.ShardAndRunTests(
+        tests, test_runner_factory, attached_devices, options.build_type,
+        test_timeout=None, num_retries=options.num_retries,
+        setup_timeout=(setup_timeout or shard.DEFAULT_TIMEOUT))
+  else: # Replicate
+    test_results, exit_code = shard.ReplicateAndRunTests(
+        tests, test_runner_factory, attached_devices, options.build_type,
+        test_timeout=None, num_retries=options.num_retries,
+        setup_timeout=(setup_timeout or shard.DEFAULT_TIMEOUT))
+
+  return (test_results, exit_code)