[Android] Add sharding for AMP instrumentation tests.

build/android/devil/utils/reraiser_thread.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.
 
 """Thread and ThreadGroup that reraise exceptions on the main thread."""
 # pylint: disable=W0212
 
 import logging
 import sys
 import threading
@@ skipping 208 matching lines @@
   Args:
     funcs: List of functions to perform on their own threads.
     watcher: Watchdog object providing timeout, by default waits forever.
 
   Returns:
     A list of return values in the order of the given functions.
   """
   thread_group = ReraiserThreadGroup(ReraiserThread(f) for f in funcs)
   thread_group.StartAll(will_block=True)
   return thread_group.GetAllReturnValues(watcher=watcher)
+
+def RunThreadsSync(threads):

[jbudorick, 2015/11/17 18:04:46]

There's no reason why both this and RunAsync should exist.

[mikecase (-- gone --), 2015/11/19 01:35:37]

Added support to RunAsync to pass args and kwargs to the funcs.

+  """Runs the given threads in parallel and blocks until all threads finish.
+
+  Args:
+    threads: List of reraiser_thread objects.
+  """
+  workers = ReraiserThreadGroup(threads)
+  workers.StartAll()
+  workers.JoinAll()